diff --git a/tavern/_core/dict_util.py b/tavern/_core/dict_util.py
index f65eaeee9..07c5364ad 100644
--- a/tavern/_core/dict_util.py
+++ b/tavern/_core/dict_util.py
@@ -27,7 +27,7 @@
 logger: logging.Logger = logging.getLogger(__name__)
 
 
-def _check_and_format_values(to_format: str, box_vars: Mapping[str, Any]) -> str:
+def _check_and_format_values(to_format: str, box_vars: Box) -> str:
     formatter = string.Formatter()
     would_format = formatter.parse(to_format)
 
diff --git a/tests/integration/Dockerfile b/tests/integration/Dockerfile
index edd2733d2..7c964d8b6 100644
--- a/tests/integration/Dockerfile
+++ b/tests/integration/Dockerfile
@@ -1,6 +1,6 @@
 FROM python:3.10-alpine
 
-RUN pip3 install 'pyjwt>=2.4.0,<3' 'flask>=2.2.3'
+RUN pip3 install 'pyjwt>=2.4.0,<3' 'flask>=2.2.3' "python-box>=6,<7"
 
 ENV FLASK_DEBUG=1
 ENV PYTHONUNBUFFERED=0
diff --git a/tests/integration/server.py b/tests/integration/server.py
index 02c5b86d9..9316b3a11 100644
--- a/tests/integration/server.py
+++ b/tests/integration/server.py
@@ -12,6 +12,7 @@
 from urllib.parse import unquote_plus, urlencode
 
 import jwt
+from box import Box
 from flask import Flask, Response, jsonify, make_response, redirect, request, session
 from itsdangerous import URLSafeTimedSerializer
 
@@ -471,6 +472,14 @@ def get_606_dict():
     return jsonify({})
 
 
+@app.route("/sub-path-query", methods=["POST"])
+def sub_path_query():
+    r = request.get_json(force=True)
+    sub_path = r["sub_path"]
+
+    return jsonify({"result": Box(r, box_dots=True)[sub_path]})
+
+
 @app.route("/magic-multi-method", methods=["GET", "POST", "DELETE"])
 def get_any_method():
     return jsonify({"method": request.method})
diff --git a/tests/integration/test_env_var_format.tavern.yaml b/tests/integration/test_env_var_format.tavern.yaml
deleted file mode 100644
index 6da193421..000000000
--- a/tests/integration/test_env_var_format.tavern.yaml
+++ /dev/null
@@ -1,15 +0,0 @@
----
-test_name: Test getting format vars from environment variables
-
-includes:
-  - !include common.yaml
-
-stages:
-  - name: Make requests using environment variables
-    request:
-      url: "{tavern.env_vars.TEST_HOST}/{first_part}/{second_part}"
-      method: GET
-    response:
-      status_code: 200
-      json:
-        status: OK
diff --git a/tests/integration/test_format.tavern.yaml b/tests/integration/test_format.tavern.yaml
new file mode 100644
index 000000000..7a9920edc
--- /dev/null
+++ b/tests/integration/test_format.tavern.yaml
@@ -0,0 +1,31 @@
+---
+test_name: Test getting format vars from environment variables
+
+includes:
+  - !include common.yaml
+
+stages:
+  - name: Make requests using environment variables
+    request:
+      url: "{tavern.env_vars.TEST_HOST}/{first_part}/{second_part}"
+      method: GET
+    response:
+      status_code: 200
+      json:
+        status: OK
+
+---
+test_name: Test slicing request vars
+
+stages:
+  - name: Make request and expect part of list in it to be returned
+    request:
+      url: "{global_host}/sub-path-query"
+      method: POST
+      json:
+        sub_path: "a.b[0].c"
+        "a": { "b": [{ "c": 3 }] }
+    response:
+      status_code: 200
+      json:
+        result: !int "{tavern.request_vars.json.a.b[0].c}"
diff --git a/tests/unit/test_helpers.py b/tests/unit/test_helpers.py
index a322e967d..fd8104a0f 100644
--- a/tests/unit/test_helpers.py
+++ b/tests/unit/test_helpers.py
@@ -8,6 +8,7 @@
 import _pytest
 import pytest
 import yaml
+from box import Box
 
 from tavern._core import exceptions
 from tavern._core.dict_util import _check_and_format_values, format_keys
@@ -291,12 +292,10 @@ def test_validate_schema_incorrect(self, nested_response):
 
 
 class TestCheckParseValues:
-    @pytest.mark.parametrize(
-        "item", [[134], {"a": 2}, yaml, yaml.load, yaml.SafeLoader]
-    )
+    @pytest.mark.parametrize("item", [yaml, yaml.load, yaml.SafeLoader])
     def test_warns_bad_type(self, item):
         with patch("tavern._core.dict_util.logger.warning") as wmock:
-            _check_and_format_values("{fd}", {"fd": item})
+            _check_and_format_values("{fd}", Box({"fd": item}))
 
         wmock.assert_called_with(
             "Formatting '%s' will result in it being coerced to a string (it is a %s)",
@@ -304,13 +303,45 @@ def test_warns_bad_type(self, item):
             type(item),
         )
 
+    @pytest.mark.parametrize(
+        "item",
+        [
+            [134],
+            {"a": 2},
+        ],
+    )
+    def test_warns_bad_type_box(self, item):
+        box = Box({"fd": item})
+        with patch("tavern._core.dict_util.logger.warning") as wmock:
+            _check_and_format_values("{fd}", box)
+
+        wmock.assert_called_with(
+            "Formatting '%s' will result in it being coerced to a string (it is a %s)",
+            "fd",
+            type(box["fd"]),
+        )
+
     @pytest.mark.parametrize("item", [1, "a", 1.3, format_keys("{s}", {"s": 2})])
     def test_no_warn_good_type(self, item):
         with patch("tavern._core.dict_util.logger.warning") as wmock:
-            _check_and_format_values("{fd}", {"fd": item})
+            _check_and_format_values("{fd}", Box({"fd": item}))
 
         assert not wmock.called
 
+    def test_format_with_array_access(self):
+        """Test accessing using array indexing format"""
+
+        assert "hello" == _check_and_format_values(
+            "{a.b.c[0].d}", Box({"a": {"b": {"c": [{"d": "hello"}]}}})
+        )
+
+    def test_format_with_dict_access(self):
+        """Test accessing using dict indexing format"""
+
+        assert "hello" == _check_and_format_values(
+            "{a[b].c[0].d}", Box({"a": {"b": {"c": [{"d": "hello"}]}}})
+        )
+
 
 class TestFormatWithJson:
     @pytest.mark.parametrize(