diff --git a/packages/common-library/requirements/_base.in b/packages/common-library/requirements/_base.in
index 73cc02bceb7..2277d690e64 100644
--- a/packages/common-library/requirements/_base.in
+++ b/packages/common-library/requirements/_base.in
@@ -3,4 +3,6 @@
 #
 --constraint ../../../requirements/constraints.txt
 
+orjson
 pydantic
+pydantic-extra-types
diff --git a/packages/common-library/requirements/_base.txt b/packages/common-library/requirements/_base.txt
index 32a8575abea..a0162daa052 100644
--- a/packages/common-library/requirements/_base.txt
+++ b/packages/common-library/requirements/_base.txt
@@ -1,11 +1,18 @@
 annotated-types==0.7.0
     # via pydantic
+orjson==3.10.10
+    # via
+    #   -c requirements/../../../requirements/constraints.txt
+    #   -r requirements/_base.in
 pydantic==2.9.2
     # via
     #   -c requirements/../../../requirements/constraints.txt
     #   -r requirements/_base.in
+    #   pydantic-extra-types
 pydantic-core==2.23.4
     # via pydantic
+pydantic-extra-types==2.9.0
+    # via -r requirements/_base.in
 typing-extensions==4.12.2
     # via
     #   pydantic
diff --git a/packages/models-library/src/models_library/utils/json_serialization.py b/packages/common-library/src/common_library/json_serialization.py
similarity index 100%
rename from packages/models-library/src/models_library/utils/json_serialization.py
rename to packages/common-library/src/common_library/json_serialization.py
diff --git a/packages/common-library/tests/test_json_serialization.py b/packages/common-library/tests/test_json_serialization.py
new file mode 100644
index 00000000000..7684497e493
--- /dev/null
+++ b/packages/common-library/tests/test_json_serialization.py
@@ -0,0 +1,97 @@
+# pylint: disable=redefined-outer-name
+# pylint: disable=unused-argument
+# pylint: disable=unused-variable
+
+import json
+from copy import deepcopy
+from typing import Annotated, Any, TypeAlias
+from uuid import uuid4
+
+import pytest
+from common_library.json_serialization import (
+    JsonNamespace,
+    SeparatorTuple,
+    json_dumps,
+    json_loads,
+)
+from faker import Faker
+from pydantic import Field, TypeAdapter
+from pydantic.json import pydantic_encoder
+
+
+@pytest.fixture
+def fake_data_dict(faker: Faker) -> dict[str, Any]:
+    data = {
+        "uuid_as_UUID": faker.uuid4(cast_to=None),
+        "uuid_as_str": faker.uuid4(),
+        "int": faker.pyint(),
+        "float": faker.pyfloat(),
+        "str": faker.pystr(),
+        "dict": faker.pydict(),
+        "list": faker.pylist(),
+    }
+    data["object"] = deepcopy(data)
+    return data
+
+
+def test_json_dump_variants():
+
+    uuid_obj = uuid4()
+
+    with pytest.raises(TypeError) as exc_info:
+        json.dumps(uuid_obj)
+
+    assert str(exc_info.value) == "Object of type UUID is not JSON serializable"
+
+    assert json_dumps(uuid_obj) == json.dumps(str(uuid_obj))
+
+
+def test_serialized_non_str_dict_keys():
+    # tests orjson.OPT_NON_STR_KEYS option
+
+    # if a dict has a key of a type other than str it will NOT raise
+    json_dumps({1: "foo"})
+
+
+ConstrainedFloat: TypeAlias = Annotated[float, Field(ge=0.0, le=1.0)]
+
+
+def test_serialized_constraint_floats():
+    # test extension of ENCODERS_BY_TYPE used in pydantic_encoder
+
+    json_dumps({"value": 1.0})
+
+    # TypeError: Type is not JSON serializable: ProgressPercent
+    json_dumps({"value": TypeAdapter(ConstrainedFloat).validate_python(1.0)})
+
+
+def _expected_json_dumps(obj: Any, default=pydantic_encoder, **json_dumps_kwargs):
+    if "indent" not in json_dumps_kwargs:
+        json_dumps_kwargs.setdefault(
+            "separators",
+            SeparatorTuple(item_separator=",", key_separator=":"),  # compact separators
+        )
+    return json.dumps(obj, default=default, **json_dumps_kwargs)
+
+
+@pytest.mark.parametrize(
+    "kwargs",
+    [
+        pytest.param({}, id="no-kw"),
+        pytest.param({"sort_keys": True}, id="sort_keys-kw"),
+        pytest.param(
+            {"separators": (",", ":")}, id="default_separators-kw"
+        ),  # NOTE: e.g. engineio.packet has `self.json.dumps(self.data, separators=(',', ':'))`
+        pytest.param(
+            {"indent": 2}, id="indent-kw"
+        ),  # NOTE: only one-to-one with indent=2
+    ],
+)
+def test_compatiblity_with_json_interface(
+    fake_data_dict: dict[str, Any], kwargs: dict[str, Any]
+):
+    orjson_dump = JsonNamespace.dumps(fake_data_dict, **kwargs)
+    json_dump = _expected_json_dumps(fake_data_dict, **kwargs)
+
+    # NOTE: cannot compare dumps directly because orjson compacts it more
+    assert json_loads(orjson_dump) == json_loads(json_dump)
diff --git a/packages/models-library/src/models_library/service_settings_labels.py b/packages/models-library/src/models_library/service_settings_labels.py
index 851b1880cc3..0a632a7b70d 100644
--- a/packages/models-library/src/models_library/service_settings_labels.py
+++ b/packages/models-library/src/models_library/service_settings_labels.py
@@ -5,6 +5,7 @@
 from pathlib import Path
 from typing import Any, Literal, TypeAlias
 
+from common_library.json_serialization import json_dumps
 from pydantic import (
     BaseModel,
     ByteSize,
@@ -23,7 +24,6 @@
 from .generics import ListModel
 from .service_settings_nat_rule import NATRule
 from .services_resources import DEFAULT_SINGLE_SERVICE_NAME
-from .utils.json_serialization import json_dumps
 
 _BaseConfig = ConfigDict(
     extra="forbid", arbitrary_types_allowed=True, ignored_types=(cached_property,)
diff --git a/packages/models-library/src/models_library/utils/_original_fastapi_encoders.py b/packages/models-library/src/models_library/utils/_original_fastapi_encoders.py
index 4f09ae6a379..0b48328d91b 100644
--- a/packages/models-library/src/models_library/utils/_original_fastapi_encoders.py
+++ b/packages/models-library/src/models_library/utils/_original_fastapi_encoders.py
@@ -10,7 +10,7 @@
 from types import GeneratorType
 from typing import Any, Callable, Union
 
-from models_library.utils.json_serialization import ENCODERS_BY_TYPE
+from common_library.json_serialization import ENCODERS_BY_TYPE
 from pydantic import BaseModel
 from pydantic_core import PydanticUndefined, PydanticUndefinedType
 from typing_extensions import Annotated, Doc
diff --git a/packages/models-library/src/models_library/utils/labels_annotations.py b/packages/models-library/src/models_library/utils/labels_annotations.py
index ec8d1e7fd6c..26c7d7d73f5 100644
--- a/packages/models-library/src/models_library/utils/labels_annotations.py
+++ b/packages/models-library/src/models_library/utils/labels_annotations.py
@@ -8,7 +8,7 @@
 from json.decoder import JSONDecodeError
 from typing import Any, TypeAlias
 
-from .json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 
 LabelsAnnotationsDict: TypeAlias = dict[str, str]
 
diff --git a/packages/models-library/src/models_library/utils/specs_substitution.py b/packages/models-library/src/models_library/utils/specs_substitution.py
index d8a7e9cf161..d1278d69912 100644
--- a/packages/models-library/src/models_library/utils/specs_substitution.py
+++ b/packages/models-library/src/models_library/utils/specs_substitution.py
@@ -1,10 +1,9 @@
 from typing import Any, NamedTuple, TypeAlias, cast
 
 from common_library.errors_classes import OsparcErrorMixin
-
+from common_library.json_serialization import json_dumps, json_loads
 from pydantic import StrictBool, StrictFloat, StrictInt
 
-from .json_serialization import json_dumps, json_loads
 from .string_substitution import (
     SubstitutionsDict,
     TextTemplate,
diff --git a/packages/models-library/tests/test_utils_json_serialization.py b/packages/models-library/tests/test_utils_json_serialization.py
index 4e3839fc6e9..a229c16b75d 100644
--- a/packages/models-library/tests/test_utils_json_serialization.py
+++ b/packages/models-library/tests/test_utils_json_serialization.py
@@ -3,43 +3,14 @@
 # pylint: disable=unused-variable
 
 
-import json
 from copy import deepcopy
 from typing import Any
 from uuid import uuid4
 
 import pytest
+from common_library.json_serialization import json_dumps, json_loads
 from faker import Faker
-from models_library.api_schemas_long_running_tasks.base import ProgressPercent
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import (
-    JsonNamespace,
-    SeparatorTuple,
-    json_dumps,
-    json_loads,
-)
-from pydantic.json import pydantic_encoder
-
-
-def _expected_json_dumps(obj: Any, default=pydantic_encoder, **json_dumps_kwargs):
-    if "indent" not in json_dumps_kwargs:
-        json_dumps_kwargs.setdefault(
-            "separators",
-            SeparatorTuple(item_separator=",", key_separator=":"),  # compact separators
-        )
-    return json.dumps(obj, default=default, **json_dumps_kwargs)
-
-
-def test_json_dump_variants():
-
-    uuid_obj = uuid4()
-
-    with pytest.raises(TypeError) as exc_info:
-        json.dumps(uuid_obj)
-
-    assert str(exc_info.value) == "Object of type UUID is not JSON serializable"
-
-    assert json_dumps(uuid_obj) == json.dumps(str(uuid_obj))
 
 
 @pytest.fixture
@@ -75,42 +46,3 @@ def test_serialization_of_nested_dicts(fake_data_dict: dict[str, Any]):
 
     dump = json_dumps(obj)
     assert json_loads(dump) == jsonable_encoder(obj)
-
-
-@pytest.mark.parametrize(
-    "kwargs",
-    [
-        pytest.param({}, id="no-kw"),
-        pytest.param({"sort_keys": True}, id="sort_keys-kw"),
-        pytest.param(
-            {"separators": (",", ":")}, id="default_separators-kw"
-        ),  # NOTE: e.g. engineio.packet has `self.json.dumps(self.data, separators=(',', ':'))`
-        pytest.param(
-            {"indent": 2}, id="indent-kw"
-        ),  # NOTE: only one-to-one with indent=2
-    ],
-)
-def test_compatiblity_with_json_interface(
-    fake_data_dict: dict[str, Any], kwargs: dict[str, Any]
-):
-    orjson_dump = JsonNamespace.dumps(fake_data_dict, **kwargs)
-    json_dump = _expected_json_dumps(fake_data_dict, **kwargs)
-
-    # NOTE: cannot compare dumps directly because orjson compacts it more
-    assert json_loads(orjson_dump) == json_loads(json_dump)
-
-
-def test_serialized_non_str_dict_keys():
-    # tests orjson.OPT_NON_STR_KEYS option
-
-    # if a dict has a key of a type other than str it will NOT raise
-    json_dumps({1: "foo"})
-
-
-def test_serialized_constraint_floats():
-    # test extension of ENCODERS_BY_TYPE used in pydantic_encoder
-
-    json_dumps({"value": 1.0})
-
-    # TypeError: Type is not JSON serializable: ProgressPercent
-    json_dumps({"value": ProgressPercent(1.0)})
diff --git a/packages/pytest-simcore/src/pytest_simcore/helpers/aws_ec2.py b/packages/pytest-simcore/src/pytest_simcore/helpers/aws_ec2.py
index cf54561f843..1e992f4ee45 100644
--- a/packages/pytest-simcore/src/pytest_simcore/helpers/aws_ec2.py
+++ b/packages/pytest-simcore/src/pytest_simcore/helpers/aws_ec2.py
@@ -1,8 +1,8 @@
 import base64
 from collections.abc import Sequence
 
+from common_library.json_serialization import json_dumps
 from models_library.docker import DockerGenericTag
-from models_library.utils.json_serialization import json_dumps
 from types_aiobotocore_ec2 import EC2Client
 from types_aiobotocore_ec2.literals import InstanceStateNameType, InstanceTypeType
 from types_aiobotocore_ec2.type_defs import FilterTypeDef, InstanceTypeDef, TagTypeDef
diff --git a/packages/service-integration/tests/test__usecase_jupytermath.py b/packages/service-integration/tests/test__usecase_jupytermath.py
index e49f9b0512a..4b816a18198 100644
--- a/packages/service-integration/tests/test__usecase_jupytermath.py
+++ b/packages/service-integration/tests/test__usecase_jupytermath.py
@@ -13,7 +13,7 @@
 
 import pytest
 import yaml
-from models_library.utils.json_serialization import json_loads
+from common_library.json_serialization import json_loads
 from service_integration import cli
 from typer.testing import CliRunner, Result
 
diff --git a/packages/service-library/src/servicelib/aiohttp/client_session.py b/packages/service-library/src/servicelib/aiohttp/client_session.py
index 26e4e7d579c..40e49c76a4b 100644
--- a/packages/service-library/src/servicelib/aiohttp/client_session.py
+++ b/packages/service-library/src/servicelib/aiohttp/client_session.py
@@ -2,7 +2,7 @@
 from typing import cast
 
 from aiohttp import ClientSession, ClientTimeout, web
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 
 from ..utils import (
     get_http_client_request_aiohttp_connect_timeout,
diff --git a/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_error_handlers.py b/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_error_handlers.py
index ef1e91a0197..9e67b2b7f4d 100644
--- a/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_error_handlers.py
+++ b/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_error_handlers.py
@@ -1,7 +1,7 @@
 import logging
 
 from aiohttp import web
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 
 from ...long_running_tasks._errors import (
     TaskCancelledError,
diff --git a/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_routes.py b/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_routes.py
index d2e2dda98bf..1906c0bc93f 100644
--- a/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_routes.py
+++ b/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_routes.py
@@ -2,7 +2,7 @@
 from typing import Any
 
 from aiohttp import web
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from pydantic import BaseModel
 from servicelib.aiohttp import status
 
diff --git a/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_server.py b/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_server.py
index 47640c491f2..1d97f9320c8 100644
--- a/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_server.py
+++ b/packages/service-library/src/servicelib/aiohttp/long_running_tasks/_server.py
@@ -5,8 +5,8 @@
 from typing import Any
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from common_library.pydantic_networks_extension import AnyHttpUrlLegacy
-from models_library.utils.json_serialization import json_dumps
 from pydantic import PositiveFloat, TypeAdapter
 
 from ...aiohttp import status
diff --git a/packages/service-library/src/servicelib/aiohttp/requests_validation.py b/packages/service-library/src/servicelib/aiohttp/requests_validation.py
index ce4a97d54a1..5a588041682 100644
--- a/packages/service-library/src/servicelib/aiohttp/requests_validation.py
+++ b/packages/service-library/src/servicelib/aiohttp/requests_validation.py
@@ -13,7 +13,7 @@
 from typing import TypeAlias, TypeVar, Union
 
 from aiohttp import web
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from pydantic import BaseModel, ConfigDict, TypeAdapter, ValidationError
 
 from ..mimetype_constants import MIMETYPE_APPLICATION_JSON
diff --git a/packages/service-library/src/servicelib/aiohttp/rest_middlewares.py b/packages/service-library/src/servicelib/aiohttp/rest_middlewares.py
index d12ea2147d8..d5f5a04283b 100644
--- a/packages/service-library/src/servicelib/aiohttp/rest_middlewares.py
+++ b/packages/service-library/src/servicelib/aiohttp/rest_middlewares.py
@@ -13,7 +13,7 @@
 from aiohttp.web_request import Request
 from aiohttp.web_response import StreamResponse
 from common_library.error_codes import create_error_code
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 
 from ..logging_errors import create_troubleshotting_log_kwargs
 from ..mimetype_constants import MIMETYPE_APPLICATION_JSON
diff --git a/packages/service-library/src/servicelib/aiohttp/rest_responses.py b/packages/service-library/src/servicelib/aiohttp/rest_responses.py
index 52aa87497d8..1cce04ae015 100644
--- a/packages/service-library/src/servicelib/aiohttp/rest_responses.py
+++ b/packages/service-library/src/servicelib/aiohttp/rest_responses.py
@@ -1,6 +1,7 @@
 """ Utils to check, convert and compose server responses for the RESTApi
 
 """
+
 import inspect
 import json
 from collections.abc import Mapping
@@ -9,7 +10,7 @@
 
 from aiohttp import web, web_exceptions
 from aiohttp.web_exceptions import HTTPError, HTTPException
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from servicelib.aiohttp.status import HTTP_200_OK
 
 from ..mimetype_constants import MIMETYPE_APPLICATION_JSON
diff --git a/packages/service-library/src/servicelib/aiohttp/rest_utils.py b/packages/service-library/src/servicelib/aiohttp/rest_utils.py
index b25a72301d6..e026e211977 100644
--- a/packages/service-library/src/servicelib/aiohttp/rest_utils.py
+++ b/packages/service-library/src/servicelib/aiohttp/rest_utils.py
@@ -2,7 +2,7 @@
 
 from aiohttp import web
 from aiohttp.web import RouteDef, RouteTableDef
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 
 
 class EnvelopeFactory:
diff --git a/packages/service-library/src/servicelib/utils_profiling_middleware.py b/packages/service-library/src/servicelib/utils_profiling_middleware.py
index 22bc7c7d29e..5b5038e335e 100644
--- a/packages/service-library/src/servicelib/utils_profiling_middleware.py
+++ b/packages/service-library/src/servicelib/utils_profiling_middleware.py
@@ -4,7 +4,7 @@
 from contextlib import contextmanager
 from typing import Final
 
-from models_library.utils.json_serialization import json_dumps, json_loads
+from common_library.json_serialization import json_dumps, json_loads
 from pyinstrument import Profiler
 
 from .mimetype_constants import MIMETYPE_APPLICATION_JSON, MIMETYPE_APPLICATION_ND_JSON
diff --git a/packages/service-library/tests/aiohttp/test_client_session.py b/packages/service-library/tests/aiohttp/test_client_session.py
index ccc9356f07e..74b91655c31 100644
--- a/packages/service-library/tests/aiohttp/test_client_session.py
+++ b/packages/service-library/tests/aiohttp/test_client_session.py
@@ -10,7 +10,7 @@
 from aiohttp import web
 from aiohttp.client import ClientSession
 from aiohttp.test_utils import TestServer
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from servicelib.aiohttp.application_keys import APP_CLIENT_SESSION_KEY
 from servicelib.aiohttp.client_session import (
     get_client_session,
diff --git a/packages/service-library/tests/aiohttp/test_requests_validation.py b/packages/service-library/tests/aiohttp/test_requests_validation.py
index 4e1b4f4e2e7..2094349932f 100644
--- a/packages/service-library/tests/aiohttp/test_requests_validation.py
+++ b/packages/service-library/tests/aiohttp/test_requests_validation.py
@@ -9,8 +9,8 @@
 import pytest
 from aiohttp import web
 from aiohttp.test_utils import TestClient
+from common_library.json_serialization import json_dumps
 from faker import Faker
-from models_library.utils.json_serialization import json_dumps
 from pydantic import BaseModel, ConfigDict, Field
 from servicelib.aiohttp import status
 from servicelib.aiohttp.requests_validation import (
diff --git a/packages/service-library/tests/aiohttp/test_rest_middlewares.py b/packages/service-library/tests/aiohttp/test_rest_middlewares.py
index 554982e53cd..00f371544b7 100644
--- a/packages/service-library/tests/aiohttp/test_rest_middlewares.py
+++ b/packages/service-library/tests/aiohttp/test_rest_middlewares.py
@@ -14,7 +14,7 @@
 from aiohttp import web
 from aiohttp.test_utils import TestClient
 from common_library.error_codes import parse_error_code
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from servicelib.aiohttp import status
 from servicelib.aiohttp.rest_middlewares import (
     _FMSG_INTERNAL_ERROR_USER_FRIENDLY_WITH_OEC,
diff --git a/packages/service-library/tests/deferred_tasks/test_deferred_tasks.py b/packages/service-library/tests/deferred_tasks/test_deferred_tasks.py
index a03b87c4151..6dbc5d3d764 100644
--- a/packages/service-library/tests/deferred_tasks/test_deferred_tasks.py
+++ b/packages/service-library/tests/deferred_tasks/test_deferred_tasks.py
@@ -16,8 +16,8 @@
 import psutil
 import pytest
 from aiohttp.test_utils import unused_port
+from common_library.json_serialization import json_dumps
 from common_library.serialization import model_dump_with_secrets
-from models_library.utils.json_serialization import json_dumps
 from pydantic import NonNegativeFloat, NonNegativeInt
 from pytest_mock import MockerFixture
 from servicelib import redis as servicelib_redis
diff --git a/packages/settings-library/requirements/_base.txt b/packages/settings-library/requirements/_base.txt
index 64117c65d55..3d57d1af6c2 100644
--- a/packages/settings-library/requirements/_base.txt
+++ b/packages/settings-library/requirements/_base.txt
@@ -6,15 +6,23 @@ markdown-it-py==3.0.0
     # via rich
 mdurl==0.1.2
     # via markdown-it-py
+orjson==3.10.10
+    # via
+    #   -c requirements/../../../packages/common-library/requirements/../../../requirements/constraints.txt
+    #   -c requirements/../../../requirements/constraints.txt
+    #   -r requirements/../../../packages/common-library/requirements/_base.in
 pydantic==2.9.2
     # via
     #   -c requirements/../../../packages/common-library/requirements/../../../requirements/constraints.txt
     #   -c requirements/../../../requirements/constraints.txt
     #   -r requirements/../../../packages/common-library/requirements/_base.in
     #   -r requirements/_base.in
+    #   pydantic-extra-types
     #   pydantic-settings
 pydantic-core==2.23.4
     # via pydantic
+pydantic-extra-types==2.9.0
+    # via -r requirements/../../../packages/common-library/requirements/_base.in
 pydantic-settings==2.5.2
     # via -r requirements/_base.in
 pygments==2.18.0
diff --git a/packages/settings-library/src/settings_library/utils_cli.py b/packages/settings-library/src/settings_library/utils_cli.py
index e3addbc6130..8c28dfe9cb5 100644
--- a/packages/settings-library/src/settings_library/utils_cli.py
+++ b/packages/settings-library/src/settings_library/utils_cli.py
@@ -8,8 +8,8 @@
 
 import rich
 import typer
+from common_library.json_serialization import json_dumps
 from common_library.serialization import model_dump_with_secrets
-from models_library.utils.json_serialization import json_dumps
 from pydantic import ValidationError
 from pydantic_core import to_jsonable_python
 from pydantic_settings import BaseSettings
diff --git a/packages/settings-library/tests/test__pydantic_settings.py b/packages/settings-library/tests/test__pydantic_settings.py
index 2d52c1096e7..976395b1b10 100644
--- a/packages/settings-library/tests/test__pydantic_settings.py
+++ b/packages/settings-library/tests/test__pydantic_settings.py
@@ -132,8 +132,9 @@ def test_construct(monkeypatch):
     # from __init__
     settings_from_init = Settings(
         VALUE=1,
-        VALUE_ALSO_REQUIRED=10,
         VALUE_NULLABLE_REQUIRED=None,
+        VALUE_NULLABLE_REQUIRED_AS_WELL=None,
+        VALUE_REQUIRED_AS_WELL=32,
     )
 
     print(settings_from_init.model_dump_json(exclude_unset=True, indent=1))
@@ -145,6 +146,8 @@ def test_construct(monkeypatch):
             "VALUE": "1",
             "VALUE_ALSO_REQUIRED": "10",
             "VALUE_NULLABLE_REQUIRED": "null",
+            "VALUE_NULLABLE_REQUIRED_AS_WELL": "null",
+            "VALUE_REQUIRED_AS_WELL": "32",
         },
     )  # WARNING: set this env to None would not work w/o ``parse_none`` validator! bug???
 
diff --git a/packages/simcore-sdk/src/simcore_sdk/node_ports_v2/serialization_v2.py b/packages/simcore-sdk/src/simcore_sdk/node_ports_v2/serialization_v2.py
index f4d74711e18..510f7b14fbb 100644
--- a/packages/simcore-sdk/src/simcore_sdk/node_ports_v2/serialization_v2.py
+++ b/packages/simcore-sdk/src/simcore_sdk/node_ports_v2/serialization_v2.py
@@ -5,8 +5,8 @@
 from typing import Any
 
 import pydantic
+from common_library.json_serialization import json_dumps
 from models_library.projects_nodes_io import NodeID
-from models_library.utils.json_serialization import json_dumps
 from models_library.utils.nodes import compute_node_hash
 from packaging import version
 from settings_library.aws_s3_cli import AwsS3CliSettings
diff --git a/services/api-server/src/simcore_service_api_server/api/dependencies/webserver.py b/services/api-server/src/simcore_service_api_server/api/dependencies/webserver.py
index e79b7e83057..94cfed68b55 100644
--- a/services/api-server/src/simcore_service_api_server/api/dependencies/webserver.py
+++ b/services/api-server/src/simcore_service_api_server/api/dependencies/webserver.py
@@ -1,10 +1,10 @@
 import time
 from typing import Annotated
 
+from common_library.json_serialization import json_dumps
 from cryptography.fernet import Fernet
 from fastapi import Depends, FastAPI, HTTPException, status
 from fastapi.requests import Request
-from models_library.utils.json_serialization import json_dumps
 from servicelib.rest_constants import X_PRODUCT_NAME_HEADER
 
 from ..._constants import MSG_BACKEND_SERVICE_UNAVAILABLE
diff --git a/services/api-server/src/simcore_service_api_server/models/_utils_pydantic.py b/services/api-server/src/simcore_service_api_server/models/_utils_pydantic.py
index ad519ca7d24..150cac87b97 100644
--- a/services/api-server/src/simcore_service_api_server/models/_utils_pydantic.py
+++ b/services/api-server/src/simcore_service_api_server/models/_utils_pydantic.py
@@ -1,4 +1,4 @@
-from models_library.utils.json_serialization import json_dumps, json_loads
+from common_library.json_serialization import json_dumps, json_loads
 
 
 class BaseConfig:
diff --git a/services/autoscaling/src/simcore_service_autoscaling/utils/buffer_machines_pool_core.py b/services/autoscaling/src/simcore_service_autoscaling/utils/buffer_machines_pool_core.py
index dcbba97015d..66ff7972306 100644
--- a/services/autoscaling/src/simcore_service_autoscaling/utils/buffer_machines_pool_core.py
+++ b/services/autoscaling/src/simcore_service_autoscaling/utils/buffer_machines_pool_core.py
@@ -3,9 +3,9 @@
 from typing import Final
 
 from aws_library.ec2 import AWS_TAG_VALUE_MAX_LENGTH, AWSTagKey, AWSTagValue, EC2Tags
+from common_library.json_serialization import json_dumps
 from fastapi import FastAPI
 from models_library.docker import DockerGenericTag
-from models_library.utils.json_serialization import json_dumps
 from pydantic import TypeAdapter
 
 from ..constants import (
diff --git a/services/autoscaling/tests/unit/test_modules_buffer_machine_core.py b/services/autoscaling/tests/unit/test_modules_buffer_machine_core.py
index 8135ac9d2c4..c81369a89bb 100644
--- a/services/autoscaling/tests/unit/test_modules_buffer_machine_core.py
+++ b/services/autoscaling/tests/unit/test_modules_buffer_machine_core.py
@@ -17,11 +17,11 @@
 import pytest
 import tenacity
 from aws_library.ec2 import AWSTagKey, EC2InstanceBootSpecific
+from common_library.json_serialization import json_dumps
 from faker import Faker
 from fastapi import FastAPI
 from fastapi.encoders import jsonable_encoder
 from models_library.docker import DockerGenericTag
-from models_library.utils.json_serialization import json_dumps
 from pydantic import TypeAdapter
 from pytest_mock.plugin import MockerFixture
 from pytest_simcore.helpers.aws_ec2 import (
diff --git a/services/catalog/src/simcore_service_catalog/services/director.py b/services/catalog/src/simcore_service_catalog/services/director.py
index 7c6925902f4..ee1327b475c 100644
--- a/services/catalog/src/simcore_service_catalog/services/director.py
+++ b/services/catalog/src/simcore_service_catalog/services/director.py
@@ -7,10 +7,10 @@
 from typing import Any
 
 import httpx
+from common_library.json_serialization import json_dumps
 from fastapi import FastAPI, HTTPException
 from models_library.services_metadata_published import ServiceMetaDataPublished
 from models_library.services_types import ServiceKey, ServiceVersion
-from models_library.utils.json_serialization import json_dumps
 from servicelib.logging_utils import log_context
 from starlette import status
 from tenacity.asyncio import AsyncRetrying
diff --git a/services/clusters-keeper/tests/unit/test_utils_clusters.py b/services/clusters-keeper/tests/unit/test_utils_clusters.py
index 20cde00c047..55190cb46a1 100644
--- a/services/clusters-keeper/tests/unit/test_utils_clusters.py
+++ b/services/clusters-keeper/tests/unit/test_utils_clusters.py
@@ -15,6 +15,7 @@
     EC2InstanceBootSpecific,
     EC2InstanceData,
 )
+from common_library.json_serialization import json_dumps
 from faker import Faker
 from models_library.api_schemas_clusters_keeper.clusters import ClusterState
 from models_library.clusters import (
@@ -22,7 +23,6 @@
     NoAuthentication,
     TLSAuthentication,
 )
-from models_library.utils.json_serialization import json_dumps
 from pydantic import ByteSize, TypeAdapter
 from pytest_simcore.helpers.monkeypatch_envs import EnvVarsDict, setenvs_from_dict
 from simcore_service_clusters_keeper.core.settings import ApplicationSettings
diff --git a/services/director-v2/src/simcore_service_director_v2/api/routes/dynamic_services.py b/services/director-v2/src/simcore_service_director_v2/api/routes/dynamic_services.py
index 750f634bb3b..743d7ae2a66 100644
--- a/services/director-v2/src/simcore_service_director_v2/api/routes/dynamic_services.py
+++ b/services/director-v2/src/simcore_service_director_v2/api/routes/dynamic_services.py
@@ -3,6 +3,7 @@
 from typing import Annotated, Final
 
 import httpx
+from common_library.json_serialization import json_dumps
 from fastapi import APIRouter, Depends, Header, HTTPException, Request
 from fastapi.responses import RedirectResponse
 from models_library.api_schemas_directorv2.dynamic_services import (
@@ -18,7 +19,6 @@
 from models_library.service_settings_labels import SimcoreServiceLabels
 from models_library.services import ServiceKeyVersion
 from models_library.users import UserID
-from models_library.utils.json_serialization import json_dumps
 from pydantic import NonNegativeFloat, NonNegativeInt
 from servicelib.fastapi.requests_decorators import cancel_on_disconnect
 from servicelib.logging_utils import log_decorator
diff --git a/services/director-v2/src/simcore_service_director_v2/modules/db/events.py b/services/director-v2/src/simcore_service_director_v2/modules/db/events.py
index 63a74aec2df..5570664bd22 100644
--- a/services/director-v2/src/simcore_service_director_v2/modules/db/events.py
+++ b/services/director-v2/src/simcore_service_director_v2/modules/db/events.py
@@ -2,8 +2,8 @@
 
 from aiopg.sa import Engine, create_engine
 from aiopg.sa.engine import get_dialect
+from common_library.json_serialization import json_dumps
 from fastapi import FastAPI
-from models_library.utils.json_serialization import json_dumps
 from servicelib.retry_policies import PostgresRetryPolicyUponInitialization
 from settings_library.postgres import PostgresSettings
 from simcore_postgres_database.utils_aiopg import (
diff --git a/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_api/_core.py b/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_api/_core.py
index b36f17af9e5..dd80c484279 100644
--- a/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_api/_core.py
+++ b/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_api/_core.py
@@ -5,6 +5,7 @@
 
 import aiodocker
 from aiodocker.utils import clean_filters, clean_map
+from common_library.json_serialization import json_dumps
 from fastapi.encoders import jsonable_encoder
 from models_library.aiodocker_api import AioDockerServiceSpec
 from models_library.docker import to_simcore_runtime_docker_label_key
@@ -12,7 +13,6 @@
 from models_library.projects_networks import DockerNetworkName
 from models_library.projects_nodes_io import NodeID
 from models_library.services_enums import ServiceState
-from models_library.utils.json_serialization import json_dumps
 from servicelib.utils import logged_gather
 from starlette import status
 from tenacity import TryAgain, retry
diff --git a/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_compose_specs.py b/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_compose_specs.py
index c3e0a06fe64..b9d38ca6502 100644
--- a/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_compose_specs.py
+++ b/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_compose_specs.py
@@ -2,6 +2,7 @@
 from copy import deepcopy
 from typing import Any, Final, TypeAlias, TypedDict
 
+from common_library.json_serialization import json_dumps
 from fastapi.applications import FastAPI
 from models_library.docker import DockerGenericTag, StandardSimcoreDockerLabels
 from models_library.products import ProductName
@@ -21,7 +22,6 @@
 )
 from models_library.users import UserID
 from models_library.utils.docker_compose import replace_env_vars_in_compose_spec
-from models_library.utils.json_serialization import json_dumps
 from pydantic import ByteSize
 from servicelib.resources import CPU_RESOURCE_LIMIT_KEY, MEM_RESOURCE_LIMIT_KEY
 from settings_library.docker_registry import RegistrySettings
diff --git a/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_service_specs/sidecar.py b/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_service_specs/sidecar.py
index b788e455cf3..001e549bf57 100644
--- a/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_service_specs/sidecar.py
+++ b/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/docker_service_specs/sidecar.py
@@ -2,6 +2,7 @@
 from copy import deepcopy
 from typing import Any, NamedTuple
 
+from common_library.json_serialization import json_dumps
 from models_library.aiodocker_api import AioDockerServiceSpec
 from models_library.basic_types import BootModeEnum, PortInt
 from models_library.callbacks_mapping import CallbacksMapping
@@ -14,7 +15,6 @@
 )
 from models_library.resource_tracker import HardwareInfo
 from models_library.service_settings_labels import SimcoreServiceSettingsLabel
-from models_library.utils.json_serialization import json_dumps
 from pydantic import ByteSize, parse_obj_as
 from servicelib.rabbitmq import RabbitMQRPCClient
 from servicelib.rabbitmq.rpc_interfaces.efs_guardian import efs_manager
diff --git a/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/scheduler/_core/_event_create_sidecars.py b/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/scheduler/_core/_event_create_sidecars.py
index 0d7f2f8288f..6475e324950 100644
--- a/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/scheduler/_core/_event_create_sidecars.py
+++ b/services/director-v2/src/simcore_service_director_v2/modules/dynamic_sidecar/scheduler/_core/_event_create_sidecars.py
@@ -3,6 +3,7 @@
 import logging
 from typing import Any, Final
 
+from common_library.json_serialization import json_dumps
 from fastapi import FastAPI
 from fastapi.encoders import jsonable_encoder
 from models_library.aiodocker_api import AioDockerServiceSpec
@@ -17,7 +18,6 @@
 )
 from models_library.service_settings_labels import SimcoreServiceSettingsLabel
 from models_library.services import RunID
-from models_library.utils.json_serialization import json_dumps
 from servicelib.rabbitmq import RabbitMQClient, RabbitMQRPCClient
 from simcore_postgres_database.models.comp_tasks import NodeClass
 
diff --git a/services/director-v2/src/simcore_service_director_v2/utils/dask.py b/services/director-v2/src/simcore_service_director_v2/utils/dask.py
index c6229bacdc8..452f1ba50a9 100644
--- a/services/director-v2/src/simcore_service_director_v2/utils/dask.py
+++ b/services/director-v2/src/simcore_service_director_v2/utils/dask.py
@@ -8,6 +8,7 @@
 import dask_gateway  # type: ignore[import-untyped]
 import distributed
 from aiopg.sa.engine import Engine
+from common_library.json_serialization import json_dumps
 from dask_task_models_library.container_tasks.io import (
     FileUrl,
     PortValue,
@@ -29,7 +30,6 @@
 from models_library.projects_nodes_io import NodeID, NodeIDStr
 from models_library.services import ServiceKey, ServiceVersion
 from models_library.users import UserID
-from models_library.utils.json_serialization import json_dumps
 from pydantic import AnyUrl, ByteSize, ValidationError, parse_obj_as
 from servicelib.logging_utils import log_catch, log_context
 from simcore_sdk import node_ports_v2
diff --git a/services/director-v2/tests/unit/test_modules_dynamic_sidecar_client_api_public.py b/services/director-v2/tests/unit/test_modules_dynamic_sidecar_client_api_public.py
index 69c1b9bc11b..a38a5a06197 100644
--- a/services/director-v2/tests/unit/test_modules_dynamic_sidecar_client_api_public.py
+++ b/services/director-v2/tests/unit/test_modules_dynamic_sidecar_client_api_public.py
@@ -6,11 +6,11 @@
 from unittest.mock import AsyncMock
 
 import pytest
+from common_library.json_serialization import json_dumps
 from faker import Faker
 from fastapi import FastAPI, status
 from httpx import HTTPError, Response
 from models_library.sidecar_volumes import VolumeCategory, VolumeStatus
-from models_library.utils.json_serialization import json_dumps
 from pydantic import AnyHttpUrl, parse_obj_as
 from pytest_mock import MockerFixture
 from pytest_simcore.helpers.typing_env import EnvVarsDict
diff --git a/services/director-v2/tests/unit/with_dbs/test_modules_dynamic_sidecar_docker_service_specs.py b/services/director-v2/tests/unit/with_dbs/test_modules_dynamic_sidecar_docker_service_specs.py
index a05e4cd84da..edca0dfe03c 100644
--- a/services/director-v2/tests/unit/with_dbs/test_modules_dynamic_sidecar_docker_service_specs.py
+++ b/services/director-v2/tests/unit/with_dbs/test_modules_dynamic_sidecar_docker_service_specs.py
@@ -10,6 +10,7 @@
 
 import pytest
 import respx
+from common_library.json_serialization import json_dumps
 from faker import Faker
 from fastapi import FastAPI
 from fastapi.encoders import jsonable_encoder
@@ -25,7 +26,6 @@
     SimcoreServiceSettingsLabel,
 )
 from models_library.services import RunID, ServiceKeyVersion
-from models_library.utils.json_serialization import json_dumps
 from models_library.wallets import WalletInfo
 from pytest_simcore.helpers.monkeypatch_envs import setenvs_from_dict
 from pytest_simcore.helpers.typing_env import EnvVarsDict
diff --git a/services/dynamic-scheduler/src/simcore_service_dynamic_scheduler/services/director_v2/_thin_client.py b/services/dynamic-scheduler/src/simcore_service_dynamic_scheduler/services/director_v2/_thin_client.py
index e823216576b..9b7fd4be9d4 100644
--- a/services/dynamic-scheduler/src/simcore_service_dynamic_scheduler/services/director_v2/_thin_client.py
+++ b/services/dynamic-scheduler/src/simcore_service_dynamic_scheduler/services/director_v2/_thin_client.py
@@ -1,6 +1,7 @@
 import datetime
 from typing import cast
 
+from common_library.json_serialization import json_dumps
 from fastapi import FastAPI, status
 from httpx import Response, Timeout
 from models_library.api_schemas_dynamic_scheduler.dynamic_services import (
@@ -8,7 +9,6 @@
 )
 from models_library.projects_nodes_io import NodeID
 from models_library.services_resources import ServiceResourcesDictHelpers
-from models_library.utils.json_serialization import json_dumps
 from servicelib.common_headers import (
     X_DYNAMIC_SIDECAR_REQUEST_DNS,
     X_DYNAMIC_SIDECAR_REQUEST_SCHEME,
diff --git a/services/dynamic-sidecar/tests/conftest.py b/services/dynamic-sidecar/tests/conftest.py
index 0dc55477b47..04e76ecd7e2 100644
--- a/services/dynamic-sidecar/tests/conftest.py
+++ b/services/dynamic-sidecar/tests/conftest.py
@@ -14,13 +14,13 @@
 
 import pytest
 import simcore_service_dynamic_sidecar
+from common_library.json_serialization import json_dumps
 from faker import Faker
 from models_library.projects import ProjectID
 from models_library.projects_nodes import NodeID
 from models_library.services import RunID
 from models_library.services_creation import CreateServiceMetricsAdditionalParams
 from models_library.users import UserID
-from models_library.utils.json_serialization import json_dumps
 from pydantic import TypeAdapter
 from pytest_mock.plugin import MockerFixture
 from pytest_simcore.helpers.monkeypatch_envs import (
diff --git a/services/dynamic-sidecar/tests/unit/test_modules_system_monitor__disk_usage.py b/services/dynamic-sidecar/tests/unit/test_modules_system_monitor__disk_usage.py
index 97a65d4553b..06270e171ca 100644
--- a/services/dynamic-sidecar/tests/unit/test_modules_system_monitor__disk_usage.py
+++ b/services/dynamic-sidecar/tests/unit/test_modules_system_monitor__disk_usage.py
@@ -8,6 +8,7 @@
 from unittest.mock import AsyncMock, Mock
 
 import pytest
+from common_library.json_serialization import json_dumps
 from faker import Faker
 from fastapi import FastAPI
 from models_library.api_schemas_dynamic_sidecar.telemetry import (
@@ -17,7 +18,6 @@
 from models_library.projects_nodes_io import NodeID
 from models_library.services_types import RunID
 from models_library.users import UserID
-from models_library.utils.json_serialization import json_dumps
 from psutil._common import sdiskusage
 from pydantic import ByteSize, TypeAdapter
 from pytest_mock import MockerFixture
diff --git a/services/payments/src/simcore_service_payments/cli.py b/services/payments/src/simcore_service_payments/cli.py
index db884e5f99f..d493ba884bd 100644
--- a/services/payments/src/simcore_service_payments/cli.py
+++ b/services/payments/src/simcore_service_payments/cli.py
@@ -3,7 +3,7 @@
 import os
 
 import typer
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from servicelib.utils_secrets import generate_password, generate_token_secret_key
 from settings_library.postgres import PostgresSettings
 from settings_library.rabbit import RabbitSettings
diff --git a/services/storage/src/simcore_service_storage/handlers_datasets.py b/services/storage/src/simcore_service_storage/handlers_datasets.py
index 69b345247e2..2cd510bcf79 100644
--- a/services/storage/src/simcore_service_storage/handlers_datasets.py
+++ b/services/storage/src/simcore_service_storage/handlers_datasets.py
@@ -2,9 +2,9 @@
 
 from aiohttp import web
 from aiohttp.web import RouteTableDef
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_storage import FileMetaDataGet
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import json_dumps
 from servicelib.aiohttp.requests_validation import (
     parse_request_path_parameters_as,
     parse_request_query_parameters_as,
diff --git a/services/storage/src/simcore_service_storage/handlers_files.py b/services/storage/src/simcore_service_storage/handlers_files.py
index b7ad6ebb007..0f78fdaeea5 100644
--- a/services/storage/src/simcore_service_storage/handlers_files.py
+++ b/services/storage/src/simcore_service_storage/handlers_files.py
@@ -5,6 +5,7 @@
 
 from aiohttp import web
 from aiohttp.web import RouteTableDef
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_storage import (
     FileMetaDataGet,
     FileUploadCompleteFutureResponse,
@@ -17,7 +18,6 @@
     SoftCopyBody,
 )
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import json_dumps
 from pydantic import AnyUrl, ByteSize, TypeAdapter
 from servicelib.aiohttp import status
 from servicelib.aiohttp.requests_validation import (
diff --git a/services/storage/src/simcore_service_storage/handlers_health.py b/services/storage/src/simcore_service_storage/handlers_health.py
index 5be7fda4e23..eb97bafe1ba 100644
--- a/services/storage/src/simcore_service_storage/handlers_health.py
+++ b/services/storage/src/simcore_service_storage/handlers_health.py
@@ -8,9 +8,9 @@
 
 from aiohttp import web
 from aws_library.s3 import S3AccessError
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_storage import HealthCheck, S3BucketName
 from models_library.app_diagnostics import AppStatusCheck
-from models_library.utils.json_serialization import json_dumps
 from pydantic import TypeAdapter
 from servicelib.rest_constants import RESPONSE_MODEL_POLICY
 
diff --git a/services/storage/src/simcore_service_storage/handlers_locations.py b/services/storage/src/simcore_service_storage/handlers_locations.py
index 0144d1c0910..494c1821f15 100644
--- a/services/storage/src/simcore_service_storage/handlers_locations.py
+++ b/services/storage/src/simcore_service_storage/handlers_locations.py
@@ -4,9 +4,9 @@
 
 from aiohttp import web
 from aiohttp.web import RouteTableDef
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_storage import FileLocation
 from models_library.projects_nodes_io import StorageFileID
-from models_library.utils.json_serialization import json_dumps
 from servicelib.aiohttp.application_keys import (
     APP_CONFIG_KEY,
     APP_FIRE_AND_FORGET_TASKS_KEY,
diff --git a/services/storage/src/simcore_service_storage/handlers_simcore_s3.py b/services/storage/src/simcore_service_storage/handlers_simcore_s3.py
index 47dd35bc6bc..248c415b23f 100644
--- a/services/storage/src/simcore_service_storage/handlers_simcore_s3.py
+++ b/services/storage/src/simcore_service_storage/handlers_simcore_s3.py
@@ -3,10 +3,10 @@
 
 from aiohttp import web
 from aiohttp.web import RouteTableDef
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_storage import FileMetaDataGet, FoldersBody
 from models_library.projects import ProjectID
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import json_dumps
 from servicelib.aiohttp import status
 from servicelib.aiohttp.long_running_tasks.server import (
     TaskProgress,
diff --git a/services/storage/src/simcore_service_storage/s3.py b/services/storage/src/simcore_service_storage/s3.py
index 8814db3757a..a3fa2c3e10b 100644
--- a/services/storage/src/simcore_service_storage/s3.py
+++ b/services/storage/src/simcore_service_storage/s3.py
@@ -8,7 +8,7 @@
 
 from aiohttp import web
 from aws_library.s3 import SimcoreS3API
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from servicelib.logging_utils import log_context
 from tenacity.asyncio import AsyncRetrying
 from tenacity.before_sleep import before_sleep_log
diff --git a/services/web/server/src/simcore_service_webserver/db/_aiopg.py b/services/web/server/src/simcore_service_webserver/db/_aiopg.py
index f6944e5ef67..4a45a0a00fb 100644
--- a/services/web/server/src/simcore_service_webserver/db/_aiopg.py
+++ b/services/web/server/src/simcore_service_webserver/db/_aiopg.py
@@ -10,7 +10,7 @@
 
 from aiohttp import web
 from aiopg.sa import Engine, create_engine
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from servicelib.aiohttp.aiopg_utils import is_pg_responsive
 from servicelib.aiohttp.application_keys import APP_AIOPG_ENGINE_KEY
 from servicelib.logging_utils import log_context
diff --git a/services/web/server/src/simcore_service_webserver/director_v2/_handlers.py b/services/web/server/src/simcore_service_webserver/director_v2/_handlers.py
index f794fa6f148..daffd3be369 100644
--- a/services/web/server/src/simcore_service_webserver/director_v2/_handlers.py
+++ b/services/web/server/src/simcore_service_webserver/director_v2/_handlers.py
@@ -3,11 +3,11 @@
 from typing import Any
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_webserver.computations import ComputationStart
 from models_library.clusters import ClusterID
 from models_library.projects import ProjectID
 from models_library.users import UserID
-from models_library.utils.json_serialization import json_dumps
 from pydantic import BaseModel, Field, ValidationError, parse_obj_as
 from pydantic.types import NonNegativeInt
 from servicelib.aiohttp import status
diff --git a/services/web/server/src/simcore_service_webserver/exporter/_formatter/template_json.py b/services/web/server/src/simcore_service_webserver/exporter/_formatter/template_json.py
index a8ddfd32f2a..e543510155c 100644
--- a/services/web/server/src/simcore_service_webserver/exporter/_formatter/template_json.py
+++ b/services/web/server/src/simcore_service_webserver/exporter/_formatter/template_json.py
@@ -1,7 +1,7 @@
 from pathlib import Path
 
 import aiofiles
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 
 from ...projects.models import ProjectDict
 
diff --git a/services/web/server/src/simcore_service_webserver/groups/_handlers.py b/services/web/server/src/simcore_service_webserver/groups/_handlers.py
index b6284bed8bf..ba366aaef46 100644
--- a/services/web/server/src/simcore_service_webserver/groups/_handlers.py
+++ b/services/web/server/src/simcore_service_webserver/groups/_handlers.py
@@ -4,6 +4,7 @@
 from typing import Literal
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_webserver.groups import (
     AllUsersGroups,
     GroupUserGet,
@@ -11,7 +12,6 @@
 )
 from models_library.emails import LowerCaseEmailStr
 from models_library.users import GroupID, UserID
-from models_library.utils.json_serialization import json_dumps
 from pydantic import BaseModel, Extra, Field, parse_obj_as
 from servicelib.aiohttp import status
 from servicelib.aiohttp.requests_validation import (
diff --git a/services/web/server/src/simcore_service_webserver/login/_registration_api.py b/services/web/server/src/simcore_service_webserver/login/_registration_api.py
index 1dfd1a5a500..b11dca73662 100644
--- a/services/web/server/src/simcore_service_webserver/login/_registration_api.py
+++ b/services/web/server/src/simcore_service_webserver/login/_registration_api.py
@@ -5,9 +5,9 @@
 
 from aiohttp import web
 from captcha.image import ImageCaptcha
+from common_library.json_serialization import json_dumps
 from models_library.emails import LowerCaseEmailStr
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import json_dumps
 from PIL.Image import Image
 from pydantic import EmailStr, PositiveInt, ValidationError, parse_obj_as
 from servicelib.utils_secrets import generate_passcode
diff --git a/services/web/server/src/simcore_service_webserver/login/utils.py b/services/web/server/src/simcore_service_webserver/login/utils.py
index 0e5c4ef47f2..07cc9a4154c 100644
--- a/services/web/server/src/simcore_service_webserver/login/utils.py
+++ b/services/web/server/src/simcore_service_webserver/login/utils.py
@@ -2,9 +2,9 @@
 from typing import Any
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from models_library.products import ProductName
 from models_library.users import UserID
-from models_library.utils.json_serialization import json_dumps
 from pydantic import PositiveInt
 from servicelib.aiohttp import observer
 from servicelib.aiohttp.rest_models import LogMessageType
diff --git a/services/web/server/src/simcore_service_webserver/meta_modeling/_iterations.py b/services/web/server/src/simcore_service_webserver/meta_modeling/_iterations.py
index c4b16f12caf..4cfd2bfca24 100644
--- a/services/web/server/src/simcore_service_webserver/meta_modeling/_iterations.py
+++ b/services/web/server/src/simcore_service_webserver/meta_modeling/_iterations.py
@@ -10,13 +10,13 @@
 from typing import Any, Literal, Optional
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from models_library.basic_types import KeyIDStr, SHA1Str
 from models_library.function_services_catalog import is_iterator_service
 from models_library.projects import ProjectID
 from models_library.projects_nodes import Node, OutputID, OutputTypes
 from models_library.projects_nodes_io import NodeID
 from models_library.services import ServiceMetaDataPublished
-from models_library.utils.json_serialization import json_dumps
 from pydantic import BaseModel, ValidationError
 from pydantic.fields import Field
 from pydantic.types import PositiveInt
diff --git a/services/web/server/src/simcore_service_webserver/projects/_crud_api_create.py b/services/web/server/src/simcore_service_webserver/projects/_crud_api_create.py
index 37416912e15..4886b3b6242 100644
--- a/services/web/server/src/simcore_service_webserver/projects/_crud_api_create.py
+++ b/services/web/server/src/simcore_service_webserver/projects/_crud_api_create.py
@@ -5,6 +5,7 @@
 from typing import Any, TypeAlias
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from jsonschema import ValidationError as JsonSchemaValidationError
 from models_library.api_schemas_long_running_tasks.base import ProgressPercent
 from models_library.api_schemas_webserver.projects import ProjectGet
@@ -13,7 +14,6 @@
 from models_library.projects_state import ProjectStatus
 from models_library.users import UserID
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import json_dumps
 from models_library.workspaces import UserWorkspaceAccessRightsDB
 from pydantic import parse_obj_as
 from servicelib.aiohttp.long_running_tasks.server import TaskProgress
diff --git a/services/web/server/src/simcore_service_webserver/projects/_crud_handlers.py b/services/web/server/src/simcore_service_webserver/projects/_crud_handlers.py
index 11d1f701b32..8041e83a07d 100644
--- a/services/web/server/src/simcore_service_webserver/projects/_crud_handlers.py
+++ b/services/web/server/src/simcore_service_webserver/projects/_crud_handlers.py
@@ -9,6 +9,7 @@
 import logging
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from jsonschema import ValidationError as JsonSchemaValidationError
 from models_library.api_schemas_webserver.projects import (
     EmptyModel,
@@ -24,7 +25,6 @@
 from models_library.rest_pagination import Page
 from models_library.rest_pagination_utils import paginate_data
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import json_dumps
 from pydantic import parse_obj_as
 from servicelib.aiohttp import status
 from servicelib.aiohttp.long_running_tasks.server import start_long_running_task
diff --git a/services/web/server/src/simcore_service_webserver/projects/_nodes_handlers.py b/services/web/server/src/simcore_service_webserver/projects/_nodes_handlers.py
index fd7a21eaad6..daeb1e454e0 100644
--- a/services/web/server/src/simcore_service_webserver/projects/_nodes_handlers.py
+++ b/services/web/server/src/simcore_service_webserver/projects/_nodes_handlers.py
@@ -7,6 +7,7 @@
 import logging
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_catalog.service_access_rights import (
     ServiceAccessRightsGet,
 )
@@ -31,7 +32,6 @@
 from models_library.services_resources import ServiceResourcesDict
 from models_library.users import GroupID
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import json_dumps
 from pydantic import BaseModel, Field, parse_obj_as
 from servicelib.aiohttp import status
 from servicelib.aiohttp.long_running_tasks.server import (
diff --git a/services/web/server/src/simcore_service_webserver/projects/_ports_handlers.py b/services/web/server/src/simcore_service_webserver/projects/_ports_handlers.py
index 0d2fb6f3eca..40e33893428 100644
--- a/services/web/server/src/simcore_service_webserver/projects/_ports_handlers.py
+++ b/services/web/server/src/simcore_service_webserver/projects/_ports_handlers.py
@@ -9,6 +9,7 @@
 from typing import Any, Literal
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_webserver.projects_ports import (
     ProjectInputGet,
     ProjectInputUpdate,
@@ -20,7 +21,6 @@
 from models_library.projects_nodes_io import NodeID
 from models_library.users import UserID
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import json_dumps
 from models_library.utils.services_io import JsonSchemaDict
 from pydantic import BaseModel, Field, parse_obj_as
 from servicelib.aiohttp.requests_validation import (
diff --git a/services/web/server/src/simcore_service_webserver/projects/projects_api.py b/services/web/server/src/simcore_service_webserver/projects/projects_api.py
index 8a5e69c39ce..38cd5368044 100644
--- a/services/web/server/src/simcore_service_webserver/projects/projects_api.py
+++ b/services/web/server/src/simcore_service_webserver/projects/projects_api.py
@@ -22,6 +22,7 @@
 from uuid import UUID, uuid4
 
 from aiohttp import web
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_clusters_keeper.ec2_instances import EC2InstanceTypeGet
 from models_library.api_schemas_directorv2.dynamic_services import (
     GetProjectInactivityResponse,
@@ -60,7 +61,6 @@
 from models_library.socketio import SocketMessageDict
 from models_library.users import GroupID, UserID
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from models_library.utils.json_serialization import json_dumps
 from models_library.wallets import ZERO_CREDITS, WalletID, WalletInfo
 from models_library.workspaces import UserWorkspaceAccessRightsDB
 from pydantic import ByteSize, parse_obj_as
diff --git a/services/web/server/src/simcore_service_webserver/publications/_handlers.py b/services/web/server/src/simcore_service_webserver/publications/_handlers.py
index 2d7feef016f..2653bba1390 100644
--- a/services/web/server/src/simcore_service_webserver/publications/_handlers.py
+++ b/services/web/server/src/simcore_service_webserver/publications/_handlers.py
@@ -1,8 +1,8 @@
 import logging
 
 from aiohttp import MultipartReader, hdrs, web
+from common_library.json_serialization import json_dumps
 from json2html import json2html  # type: ignore[import-untyped]
-from models_library.utils.json_serialization import json_dumps
 from servicelib.aiohttp import status
 from servicelib.mimetype_constants import (
     MIMETYPE_APPLICATION_JSON,
diff --git a/services/web/server/src/simcore_service_webserver/socketio/server.py b/services/web/server/src/simcore_service_webserver/socketio/server.py
index fed57e4d57e..617af26072f 100644
--- a/services/web/server/src/simcore_service_webserver/socketio/server.py
+++ b/services/web/server/src/simcore_service_webserver/socketio/server.py
@@ -3,7 +3,7 @@
 from collections.abc import AsyncIterator
 
 from aiohttp import web
-from models_library.utils.json_serialization import JsonNamespace
+from common_library.json_serialization import JsonNamespace
 from servicelib.socketio_utils import cleanup_socketio_async_pubsub_manager
 from socketio import AsyncAioPikaManager, AsyncServer  # type: ignore[import-untyped]
 
diff --git a/services/web/server/src/simcore_service_webserver/statics/_events.py b/services/web/server/src/simcore_service_webserver/statics/_events.py
index 49cef6deb64..4348fa5ef3d 100644
--- a/services/web/server/src/simcore_service_webserver/statics/_events.py
+++ b/services/web/server/src/simcore_service_webserver/statics/_events.py
@@ -6,7 +6,7 @@
 from aiohttp import web
 from aiohttp.client import ClientSession
 from aiohttp.client_exceptions import ClientConnectionError, ClientError
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from servicelib.aiohttp.client_session import get_client_session
 from tenacity.asyncio import AsyncRetrying
 from tenacity.before import before_log
diff --git a/services/web/server/src/simcore_service_webserver/users/schemas.py b/services/web/server/src/simcore_service_webserver/users/schemas.py
index 53c9ee9b756..cae3f5b7df5 100644
--- a/services/web/server/src/simcore_service_webserver/users/schemas.py
+++ b/services/web/server/src/simcore_service_webserver/users/schemas.py
@@ -2,12 +2,12 @@
 from typing import Any, ClassVar, Literal
 from uuid import UUID
 
+from common_library.json_serialization import json_dumps
 from models_library.api_schemas_webserver._base import OutputSchema
 from models_library.api_schemas_webserver.groups import AllUsersGroups
 from models_library.api_schemas_webserver.users_preferences import AggregatedPreferences
 from models_library.emails import LowerCaseEmailStr
 from models_library.users import FirstNameStr, LastNameStr, UserID
-from models_library.utils.json_serialization import json_dumps
 from pydantic import BaseModel, Field, root_validator, validator
 from simcore_postgres_database.models.users import UserRole
 
diff --git a/services/web/server/src/simcore_service_webserver/utils_aiohttp.py b/services/web/server/src/simcore_service_webserver/utils_aiohttp.py
index ae35a58ee6f..4adaa5ef468 100644
--- a/services/web/server/src/simcore_service_webserver/utils_aiohttp.py
+++ b/services/web/server/src/simcore_service_webserver/utils_aiohttp.py
@@ -6,8 +6,8 @@
 from aiohttp import web
 from aiohttp.web_exceptions import HTTPError, HTTPException
 from aiohttp.web_routedef import RouteDef, RouteTableDef
+from common_library.json_serialization import json_dumps
 from models_library.generics import Envelope
-from models_library.utils.json_serialization import json_dumps
 from pydantic import BaseModel, Field
 from pydantic.generics import GenericModel
 from servicelib.common_headers import X_FORWARDED_PROTO
diff --git a/services/web/server/src/simcore_service_webserver/utils_rate_limiting.py b/services/web/server/src/simcore_service_webserver/utils_rate_limiting.py
index 3c16f2b3340..8c1117300ca 100644
--- a/services/web/server/src/simcore_service_webserver/utils_rate_limiting.py
+++ b/services/web/server/src/simcore_service_webserver/utils_rate_limiting.py
@@ -5,7 +5,7 @@
 from typing import Callable, NamedTuple
 
 from aiohttp.web_exceptions import HTTPTooManyRequests
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 
 
 class RateLimitSetup(NamedTuple):
diff --git a/services/web/server/src/simcore_service_webserver/version_control/_handlers_base.py b/services/web/server/src/simcore_service_webserver/version_control/_handlers_base.py
index 171cf937704..c40b27946f2 100644
--- a/services/web/server/src/simcore_service_webserver/version_control/_handlers_base.py
+++ b/services/web/server/src/simcore_service_webserver/version_control/_handlers_base.py
@@ -3,7 +3,7 @@
 from typing import Any
 
 from aiohttp import web
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from pydantic.error_wrappers import ValidationError
 from servicelib.aiohttp.typing_extension import Handler
 
diff --git a/services/web/server/src/simcore_service_webserver/version_control/db.py b/services/web/server/src/simcore_service_webserver/version_control/db.py
index 9ae6162c09e..ee884df6e9c 100644
--- a/services/web/server/src/simcore_service_webserver/version_control/db.py
+++ b/services/web/server/src/simcore_service_webserver/version_control/db.py
@@ -7,9 +7,9 @@
 import sqlalchemy as sa
 from aiopg.sa import SAConnection
 from aiopg.sa.result import RowProxy
+from common_library.json_serialization import json_dumps
 from models_library.basic_types import SHA1Str
 from models_library.projects import ProjectIDStr
-from models_library.utils.json_serialization import json_dumps
 from pydantic.types import NonNegativeInt, PositiveInt
 from simcore_postgres_database.models.projects import projects
 from simcore_postgres_database.models.projects_version_control import (
diff --git a/services/web/server/tests/conftest.py b/services/web/server/tests/conftest.py
index a57dfd3c852..76fc55eba28 100644
--- a/services/web/server/tests/conftest.py
+++ b/services/web/server/tests/conftest.py
@@ -16,11 +16,11 @@
 import pytest
 import simcore_service_webserver
 from aiohttp.test_utils import TestClient
+from common_library.json_serialization import json_dumps
 from faker import Faker
 from models_library.projects import ProjectID
 from models_library.projects_nodes_io import NodeID
 from models_library.projects_state import ProjectState
-from models_library.utils.json_serialization import json_dumps
 from pytest_simcore.helpers.assert_checks import assert_status
 from pytest_simcore.helpers.dict_tools import ConfigDict
 from pytest_simcore.helpers.monkeypatch_envs import EnvVarsDict, setenvs_from_dict
diff --git a/services/web/server/tests/integration/02/test_computation.py b/services/web/server/tests/integration/02/test_computation.py
index 0a73402e68d..4dcb55e19d9 100644
--- a/services/web/server/tests/integration/02/test_computation.py
+++ b/services/web/server/tests/integration/02/test_computation.py
@@ -15,8 +15,8 @@
 import pytest
 import sqlalchemy as sa
 from aiohttp.test_utils import TestClient
+from common_library.json_serialization import json_dumps
 from models_library.projects_state import RunningState
-from models_library.utils.json_serialization import json_dumps
 from pytest_simcore.helpers.assert_checks import assert_status
 from servicelib.aiohttp import status
 from servicelib.aiohttp.application import create_safe_application
diff --git a/services/web/server/tests/unit/isolated/test_application_settings.py b/services/web/server/tests/unit/isolated/test_application_settings.py
index 65fe54ff483..17e3502bfa5 100644
--- a/services/web/server/tests/unit/isolated/test_application_settings.py
+++ b/services/web/server/tests/unit/isolated/test_application_settings.py
@@ -6,7 +6,7 @@
 
 import pytest
 from aiohttp import web
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from pydantic import HttpUrl, parse_obj_as
 from pytest_simcore.helpers.typing_env import EnvVarsDict
 from simcore_service_webserver.application_settings import (
diff --git a/services/web/server/tests/unit/isolated/test_products_model.py b/services/web/server/tests/unit/isolated/test_products_model.py
index 45ecbd0f4c3..31c4ac60699 100644
--- a/services/web/server/tests/unit/isolated/test_products_model.py
+++ b/services/web/server/tests/unit/isolated/test_products_model.py
@@ -6,7 +6,7 @@
 from typing import Any
 
 import pytest
-from models_library.utils.json_serialization import json_dumps
+from common_library.json_serialization import json_dumps
 from pydantic import BaseModel
 from simcore_service_webserver.products._db import Product
 
diff --git a/services/web/server/tests/unit/with_dbs/01/studies_dispatcher/test_studies_dispatcher_handlers.py b/services/web/server/tests/unit/with_dbs/01/studies_dispatcher/test_studies_dispatcher_handlers.py
index 7933270984a..420adf921ac 100644
--- a/services/web/server/tests/unit/with_dbs/01/studies_dispatcher/test_studies_dispatcher_handlers.py
+++ b/services/web/server/tests/unit/with_dbs/01/studies_dispatcher/test_studies_dispatcher_handlers.py
@@ -16,8 +16,8 @@
 from aiohttp import ClientResponse, ClientSession
 from aiohttp.test_utils import TestClient, TestServer
 from aioresponses import aioresponses
+from common_library.json_serialization import json_dumps
 from models_library.projects_state import ProjectLocked, ProjectStatus
-from models_library.utils.json_serialization import json_dumps
 from pydantic import BaseModel, ByteSize, parse_obj_as
 from pytest_mock import MockerFixture
 from pytest_simcore.helpers.assert_checks import assert_status
diff --git a/services/web/server/tests/unit/with_dbs/03/meta_modeling/test_meta_modeling_iterations.py b/services/web/server/tests/unit/with_dbs/03/meta_modeling/test_meta_modeling_iterations.py
index 20cb885bdfa..ec22f84f441 100644
--- a/services/web/server/tests/unit/with_dbs/03/meta_modeling/test_meta_modeling_iterations.py
+++ b/services/web/server/tests/unit/with_dbs/03/meta_modeling/test_meta_modeling_iterations.py
@@ -7,11 +7,11 @@
 import pytest
 from aiohttp import ClientResponse
 from aiohttp.test_utils import TestClient
+from common_library.json_serialization import json_dumps
 from faker import Faker
 from models_library.projects import Project
 from models_library.projects_nodes import Node
 from models_library.services_resources import ServiceResourcesDict
-from models_library.utils.json_serialization import json_dumps
 from pytest_mock import MockerFixture
 from pytest_simcore.helpers.assert_checks import assert_status
 from pytest_simcore.helpers.monkeypatch_envs import EnvVarsDict, setenvs_from_dict