diff --git a/llama-index-core/llama_index/core/schema.py b/llama-index-core/llama_index/core/schema.py
index 4e9c93d32ae87..28097c91f7401 100644
--- a/llama-index-core/llama_index/core/schema.py
+++ b/llama-index-core/llama_index/core/schema.py
@@ -100,7 +100,7 @@ def to_dict(self, **kwargs: Any) -> Dict[str, Any]:
 
     def to_json(self, **kwargs: Any) -> str:
         data = self.to_dict(**kwargs)
-        return json.dumps(data)
+        return json.dumps(data, ensure_ascii=False, indent=4)
 
     # TODO: return type here not supported by current mypy version
     @classmethod
diff --git a/llama-index-core/llama_index/core/storage/chat_store/simple_chat_store.py b/llama-index-core/llama_index/core/storage/chat_store/simple_chat_store.py
index 47c6a3172cbe6..fbd724fed7020 100644
--- a/llama-index-core/llama_index/core/storage/chat_store/simple_chat_store.py
+++ b/llama-index-core/llama_index/core/storage/chat_store/simple_chat_store.py
@@ -70,7 +70,7 @@ def persist(
         if not fs.exists(dirpath):
             fs.makedirs(dirpath)
 
-        with fs.open(persist_path, "w") as f:
+        with fs.open(persist_path, "w", encoding="utf8") as f:
             f.write(json.dumps(self.json()))
 
     @classmethod
diff --git a/llama-index-core/llama_index/core/storage/kvstore/simple_kvstore.py b/llama-index-core/llama_index/core/storage/kvstore/simple_kvstore.py
index 98f1bde5c8a50..6b88844d731c9 100644
--- a/llama-index-core/llama_index/core/storage/kvstore/simple_kvstore.py
+++ b/llama-index-core/llama_index/core/storage/kvstore/simple_kvstore.py
@@ -84,8 +84,8 @@ def persist(
         if not fs.exists(dirpath):
             fs.makedirs(dirpath)
 
-        with fs.open(persist_path, "w") as f:
-            f.write(json.dumps(self._data))
+        with fs.open(persist_path, "w", encoding="utf-8") as f:
+            f.write(json.dumps(self._data, ensure_ascii=False, indent=4))
 
     @classmethod
     def from_persist_path(