diff --git a/sqladmin/models.py b/sqladmin/models.py
index 5215ee8e..059bed41 100644
--- a/sqladmin/models.py
+++ b/sqladmin/models.py
@@ -1200,12 +1200,16 @@ async def generate() -> AsyncGenerator[str, None]:
             len_data = len(data)
             last_idx = len_data - 1
             separator = "," if len_data > 1 else ""
+            row_dict = {}
 
             for idx, row in enumerate(data):
-                row_dict = {
-                    name: str(await self.get_prop_value(row, name))
-                    for name in self._export_prop_names
-                }
+                for name in self._export_prop_names:
+                    value = await self.get_prop_value(row, name)
+                    try:
+                        json.dumps(value)
+                    except TypeError:
+                        value = str(value)
+                    row_dict[name] = value
                 yield json.dumps(row_dict) + (separator if idx < last_idx else "")
 
             yield "]"
diff --git a/tests/test_views/test_view_sync.py b/tests/test_views/test_view_sync.py
index 00fc8448..c55b142d 100644
--- a/tests/test_views/test_view_sync.py
+++ b/tests/test_views/test_view_sync.py
@@ -753,7 +753,7 @@ def test_export_json_complex_model(client: TestClient) -> None:
 
     response = client.get("/admin/address/export/json")
     assert response.text == json.dumps(
-        [{"id": "1", "user_id": "1", "user": "User 1", "user.profile.id": "None"}]
+        [{"id": 1, "user_id": 1, "user": "User 1", "user.profile.id": None}]
     )