diff --git a/api/dev/generate_swagger_specs.py b/api/dev/generate_swagger_specs.py
index 9122f3ab24..254310cd2a 100644
--- a/api/dev/generate_swagger_specs.py
+++ b/api/dev/generate_swagger_specs.py
@@ -20,7 +20,6 @@ from pathlib import Path
 from typing import Protocol, TypeGuard
 
 from flask import Flask
-from flask_restx.swagger import Swagger
 
 logger = logging.getLogger(__name__)
 
@@ -48,9 +47,6 @@ SPEC_TARGETS: tuple[SpecTarget, ...] = (
     SpecTarget(route="/v1/swagger.json", filename="service-swagger.json", namespace="service"),
 )
 
-_ORIGINAL_REGISTER_MODEL = Swagger.register_model
-_ORIGINAL_REGISTER_FIELD = Swagger.register_field
-
 
 def _is_inline_field_map(value: object) -> TypeGuard[dict[object, object]]:
     """Return whether a nested field map is an anonymous inline mapping."""
@@ -152,56 +148,14 @@ def apply_runtime_defaults() -> None:
     dify_config.SWAGGER_UI_ENABLED = os.environ["SWAGGER_UI_ENABLED"].lower() == "true"
 
 
-def _patch_swagger_for_inline_nested_dicts() -> None:
-    """Teach Flask-RESTX Swagger generation to tolerate inline nested field maps.
-
-    Some existing controllers use `fields.Nested({...})` with a raw field mapping
-    instead of a named `api.model(...)`. Flask-RESTX crashes on those anonymous
-    dicts during schema registration, so this helper upgrades them into temporary
-    named models at export time.
-    """
-
-    if getattr(Swagger, "_dify_inline_nested_dict_patch", False):
-        return
-
-    def get_or_create_inline_model(self: Swagger, nested_fields: dict[object, object]) -> object:
-        anonymous_models = getattr(self, "_anonymous_inline_models", None)
-        if anonymous_models is None:
-            anonymous_models = {}
-            self.__dict__["_anonymous_inline_models"] = anonymous_models
-
-        anonymous_name = anonymous_models.get(id(nested_fields))
-        if anonymous_name is None:
-            anonymous_name = _inline_model_name(nested_fields)
-            anonymous_models[id(nested_fields)] = anonymous_name
-            if anonymous_name not in self.api.models:
-                self.api.model(anonymous_name, nested_fields)
-
-        return self.api.models[anonymous_name]
-
-    def register_model_with_inline_dict_support(self: Swagger, model: object) -> dict[str, str]:
-        if _is_inline_field_map(model):
-            model = get_or_create_inline_model(self, model)
-
-        return _ORIGINAL_REGISTER_MODEL(self, model)
-
-    def register_field_with_inline_dict_support(self: Swagger, field: object) -> None:
-        nested = getattr(field, "nested", None)
-        if _is_inline_field_map(nested):
-            field.model = get_or_create_inline_model(self, nested)  # type: ignore
-
-        _ORIGINAL_REGISTER_FIELD(self, field)
-
-    Swagger.register_model = register_model_with_inline_dict_support
-    Swagger.register_field = register_field_with_inline_dict_support
-    Swagger._dify_inline_nested_dict_patch = True
-
-
 def create_spec_app() -> Flask:
     """Build a minimal Flask app that only mounts the Swagger-producing blueprints."""
 
     apply_runtime_defaults()
-    _patch_swagger_for_inline_nested_dicts()
+
+    from libs.flask_restx_compat import patch_swagger_for_inline_nested_dicts
+
+    patch_swagger_for_inline_nested_dicts()
 
     app = Flask(__name__)
 
diff --git a/api/libs/external_api.py b/api/libs/external_api.py
index f907d17750..64eb99a42b 100644
--- a/api/libs/external_api.py
+++ b/api/libs/external_api.py
@@ -9,6 +9,7 @@ from werkzeug.http import HTTP_STATUS_CODES
 
 from configs import dify_config
 from core.errors.error import AppInvokeQuotaExceededError
+from libs.flask_restx_compat import patch_swagger_for_inline_nested_dicts
 from libs.token import build_force_logout_cookie_headers
 
 
@@ -120,6 +121,7 @@ class ExternalApi(Api):
     }
 
     def __init__(self, app: Blueprint | Flask, *args, **kwargs):
+        patch_swagger_for_inline_nested_dicts()
         kwargs.setdefault("authorizations", self._authorizations)
         kwargs.setdefault("security", "Bearer")
         kwargs["add_specs"] = dify_config.SWAGGER_UI_ENABLED
diff --git a/api/libs/flask_restx_compat.py b/api/libs/flask_restx_compat.py
new file mode 100644
index 0000000000..7c91c01b46
--- /dev/null
+++ b/api/libs/flask_restx_compat.py
@@ -0,0 +1,68 @@
+"""Compatibility helpers for Dify's Flask-RESTX Swagger integration.
+
+These helpers are temporary bridges for legacy Flask-RESTX field contracts
+while controllers migrate their request and response documentation to Pydantic
+models. Keep the behavior centralized so live Swagger endpoints and offline
+spec export fail or succeed in the same way.
+"""
+
+from flask import current_app
+from flask_restx.swagger import Swagger
+
+
+def patch_swagger_for_inline_nested_dicts() -> None:
+    """Allow Swagger generation to handle legacy inline Flask-RESTX field dicts.
+
+    Some existing controllers use raw field mappings in `fields.Nested({...})`
+    or directly in `@namespace.response(...)`. Runtime marshalling accepts that,
+    but Flask-RESTX Swagger registration expects a named model. Convert those
+    anonymous mappings into temporary named models during docs generation.
+    """
+
+    if getattr(Swagger, "_dify_inline_nested_dict_patch", False):
+        return
+
+    original_register_model = Swagger.register_model
+    original_register_field = Swagger.register_field
+    original_as_dict = Swagger.as_dict
+
+    def get_or_create_inline_model(self: Swagger, nested_fields: dict[object, object]) -> object:
+        anonymous_models = getattr(self, "_anonymous_inline_models", None)
+        if anonymous_models is None:
+            anonymous_models = {}
+            self._anonymous_inline_models = anonymous_models  # type: ignore[missing-attribute]
+
+        anonymous_name = anonymous_models.get(id(nested_fields))
+        if anonymous_name is None:
+            anonymous_name = f"_AnonymousInlineModel{len(anonymous_models) + 1}"
+            anonymous_models[id(nested_fields)] = anonymous_name
+            self.api.model(anonymous_name, nested_fields)
+
+        return self.api.models[anonymous_name]
+
+    def register_model_with_inline_dict_support(self: Swagger, model: object) -> dict[str, str]:
+        if isinstance(model, dict):
+            model = get_or_create_inline_model(self, model)
+
+        return original_register_model(self, model)
+
+    def register_field_with_inline_dict_support(self: Swagger, field: object) -> None:
+        nested = getattr(field, "nested", None)
+        if isinstance(nested, dict):
+            field.model = get_or_create_inline_model(self, nested)  # type: ignore[attr-defined]
+
+        original_register_field(self, field)
+
+    def as_dict_with_inline_dict_support(self: Swagger):
+        # Temporary set RESTX_INCLUDE_ALL_MODELS = false to prevent "length changed while iterating" error
+        include_all_models = current_app.config.get("RESTX_INCLUDE_ALL_MODELS", False)
+        current_app.config["RESTX_INCLUDE_ALL_MODELS"] = False
+        try:
+            return original_as_dict(self)
+        finally:
+            current_app.config["RESTX_INCLUDE_ALL_MODELS"] = include_all_models
+
+    Swagger.register_model = register_model_with_inline_dict_support
+    Swagger.register_field = register_field_with_inline_dict_support
+    Swagger.as_dict = as_dict_with_inline_dict_support
+    Swagger._dify_inline_nested_dict_patch = True
diff --git a/api/openapi/markdown/console-swagger.md b/api/openapi/markdown/console-swagger.md
index a69cecd83c..910193326c 100644
--- a/api/openapi/markdown/console-swagger.md
+++ b/api/openapi/markdown/console-swagger.md
@@ -14764,3 +14764,335 @@ FastOpenAPI proof of concept for Dify API
 | release_date | string | Release date of latest version | Yes |
 | release_notes | string | Release notes for latest version | Yes |
 | version | string | Latest version number | Yes |
+
+## FastOpenAPI Preview (OpenAPI 3.0)
+
+### Dify API (FastOpenAPI PoC)
+FastOpenAPI proof of concept for Dify API
+
+#### Version: 1.0
+
+---
+
+##### [GET] /console/api/init
+**Get initialization validation status.**
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 200 | OK | **application/json**: [InitStatusResponse](#initstatusresponse)<br> |
+
+##### [POST] /console/api/init
+**Validate initialization password.**
+
+###### Request Body
+
+| Required | Schema |
+| -------- | ------ |
+|  Yes | **application/json**: [InitValidatePayload](#initvalidatepayload)<br> |
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 201 | Created | **application/json**: [InitValidateResponse](#initvalidateresponse)<br> |
+
+##### [GET] /console/api/ping
+**Health check endpoint for connection testing.**
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 200 | OK | **application/json**: [PingResponse](#pingresponse)<br> |
+
+##### [GET] /console/api/setup
+**Get system setup status.
+
+    NOTE: This endpoint is unauthenticated by design.
+
+    During first-time bootstrap there is no admin account yet, so frontend initialization must be
+    able to query setup progress before any login flow exists.
+
+    Only bootstrap-safe status information should be returned by this endpoint.
+    **
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 200 | OK | **application/json**: [SetupStatusResponse](#setupstatusresponse)<br> |
+
+##### [POST] /console/api/setup
+**Initialize system setup with admin account.
+
+    NOTE: This endpoint is unauthenticated by design for first-time bootstrap.
+    Access is restricted by deployment mode (`SELF_HOSTED`), one-time setup guards,
+    and init-password validation rather than user session authentication.
+    **
+
+###### Request Body
+
+| Required | Schema |
+| -------- | ------ |
+|  Yes | **application/json**: [SetupRequestPayload](#setuprequestpayload)<br> |
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 201 | Created | **application/json**: [SetupResponse](#setupresponse)<br> |
+
+##### [GET] /console/api/version
+**Check for application version updates.**
+
+###### Parameters
+
+| Name | Located in | Description | Required | Schema |
+| ---- | ---------- | ----------- | -------- | ------ |
+| current_version | query |  | Yes | string |
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 200 | OK | **application/json**: [VersionResponse](#versionresponse)<br> |
+
+---
+##### Schemas
+
+###### ErrorSchema
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| error | { **"details"**: string, **"message"**: string, **"status"**: integer, **"type"**: string } |  | Yes |
+
+###### InitStatusResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| status | string, <br>**Available values:** "finished", "not_started" | Initialization status<br>*Enum:* `"finished"`, `"not_started"` | Yes |
+
+###### InitValidatePayload
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| password | string | Initialization password | Yes |
+
+###### InitValidateResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| result | string | Operation result | Yes |
+
+###### PingResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| result | string | Health check result | Yes |
+
+###### SetupRequestPayload
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| email | string | Admin email address | Yes |
+| language |  | Admin language | No |
+| name | string | Admin name (max 30 characters) | Yes |
+| password | string | Admin password | Yes |
+
+###### SetupResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| result | string | Setup result | Yes |
+
+###### SetupStatusResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| setup_at |  | Setup completion time (ISO format) | No |
+| step | string, <br>**Available values:** "finished", "not_started" | Setup step status<br>*Enum:* `"finished"`, `"not_started"` | Yes |
+
+###### VersionFeatures
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| can_replace_logo | boolean | Whether logo replacement is supported | Yes |
+| model_load_balancing_enabled | boolean | Whether model load balancing is enabled | Yes |
+
+###### VersionResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| can_auto_update | boolean | Whether auto-update is supported | Yes |
+| features | [VersionFeatures](#versionfeatures) | Feature flags and capabilities | Yes |
+| release_date | string | Release date of latest version | Yes |
+| release_notes | string | Release notes for latest version | Yes |
+| version | string | Latest version number | Yes |
+
+## FastOpenAPI Preview (OpenAPI 3.0)
+
+### Dify API (FastOpenAPI PoC)
+FastOpenAPI proof of concept for Dify API
+
+#### Version: 1.0
+
+---
+
+##### [GET] /console/api/init
+**Get initialization validation status.**
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 200 | OK | **application/json**: [InitStatusResponse](#initstatusresponse)<br> |
+
+##### [POST] /console/api/init
+**Validate initialization password.**
+
+###### Request Body
+
+| Required | Schema |
+| -------- | ------ |
+|  Yes | **application/json**: [InitValidatePayload](#initvalidatepayload)<br> |
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 201 | Created | **application/json**: [InitValidateResponse](#initvalidateresponse)<br> |
+
+##### [GET] /console/api/ping
+**Health check endpoint for connection testing.**
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 200 | OK | **application/json**: [PingResponse](#pingresponse)<br> |
+
+##### [GET] /console/api/setup
+**Get system setup status.
+
+    NOTE: This endpoint is unauthenticated by design.
+
+    During first-time bootstrap there is no admin account yet, so frontend initialization must be
+    able to query setup progress before any login flow exists.
+
+    Only bootstrap-safe status information should be returned by this endpoint.
+    **
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 200 | OK | **application/json**: [SetupStatusResponse](#setupstatusresponse)<br> |
+
+##### [POST] /console/api/setup
+**Initialize system setup with admin account.
+
+    NOTE: This endpoint is unauthenticated by design for first-time bootstrap.
+    Access is restricted by deployment mode (`SELF_HOSTED`), one-time setup guards,
+    and init-password validation rather than user session authentication.
+    **
+
+###### Request Body
+
+| Required | Schema |
+| -------- | ------ |
+|  Yes | **application/json**: [SetupRequestPayload](#setuprequestpayload)<br> |
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 201 | Created | **application/json**: [SetupResponse](#setupresponse)<br> |
+
+##### [GET] /console/api/version
+**Check for application version updates.**
+
+###### Parameters
+
+| Name | Located in | Description | Required | Schema |
+| ---- | ---------- | ----------- | -------- | ------ |
+| current_version | query |  | Yes | string |
+
+###### Responses
+
+| Code | Description | Schema |
+| ---- | ----------- | ------ |
+| 200 | OK | **application/json**: [VersionResponse](#versionresponse)<br> |
+
+---
+##### Schemas
+
+###### ErrorSchema
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| error | { **"details"**: string, **"message"**: string, **"status"**: integer, **"type"**: string } |  | Yes |
+
+###### InitStatusResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| status | string, <br>**Available values:** "finished", "not_started" | Initialization status<br>*Enum:* `"finished"`, `"not_started"` | Yes |
+
+###### InitValidatePayload
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| password | string | Initialization password | Yes |
+
+###### InitValidateResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| result | string | Operation result | Yes |
+
+###### PingResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| result | string | Health check result | Yes |
+
+###### SetupRequestPayload
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| email | string | Admin email address | Yes |
+| language |  | Admin language | No |
+| name | string | Admin name (max 30 characters) | Yes |
+| password | string | Admin password | Yes |
+
+###### SetupResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| result | string | Setup result | Yes |
+
+###### SetupStatusResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| setup_at |  | Setup completion time (ISO format) | No |
+| step | string, <br>**Available values:** "finished", "not_started" | Setup step status<br>*Enum:* `"finished"`, `"not_started"` | Yes |
+
+###### VersionFeatures
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| can_replace_logo | boolean | Whether logo replacement is supported | Yes |
+| model_load_balancing_enabled | boolean | Whether model load balancing is enabled | Yes |
+
+###### VersionResponse
+
+| Name | Type | Description | Required |
+| ---- | ---- | ----------- | -------- |
+| can_auto_update | boolean | Whether auto-update is supported | Yes |
+| features | [VersionFeatures](#versionfeatures) | Feature flags and capabilities | Yes |
+| release_date | string | Release date of latest version | Yes |
+| release_notes | string | Release notes for latest version | Yes |
+| version | string | Latest version number | Yes |
diff --git a/api/tests/unit_tests/controllers/test_swagger.py b/api/tests/unit_tests/controllers/test_swagger.py
new file mode 100644
index 0000000000..fc8af9deb8
--- /dev/null
+++ b/api/tests/unit_tests/controllers/test_swagger.py
@@ -0,0 +1,33 @@
+"""Swagger JSON rendering tests for Flask-RESTX API blueprints."""
+
+import pytest
+from flask import Flask
+
+
+def test_swagger_json_endpoints_render(monkeypatch: pytest.MonkeyPatch):
+    from configs import dify_config
+    from controllers.console import bp as console_bp
+    from controllers.service_api import bp as service_api_bp
+    from controllers.web import bp as web_bp
+
+    monkeypatch.setattr(dify_config, "SWAGGER_UI_ENABLED", True)
+
+    app = Flask(__name__)
+    app.config["TESTING"] = True
+    app.config["RESTX_INCLUDE_ALL_MODELS"] = True
+    app.register_blueprint(console_bp)
+    app.register_blueprint(web_bp)
+    app.register_blueprint(service_api_bp)
+
+    client = app.test_client()
+
+    for route in ("/console/api/swagger.json", "/api/swagger.json", "/v1/swagger.json"):
+        response = client.get(route)
+
+        assert response.status_code == 200
+        payload = response.get_json()
+        assert payload["swagger"] == "2.0"
+        assert "paths" in payload
+        assert "definitions" in payload
+
+    assert app.config["RESTX_INCLUDE_ALL_MODELS"] is True