FastAPI Swagger Plugin

This plugin updates the FastAPI app to include a latest Swagger UI distribution. Also, it works locally and does not depend on the @tiangolo domains and cdns.

Why?

The FastAPI already includes a Swagger UI. However, author updates swagger not so often. Moreover he uses his own hosts for the resources, and they are not always available (especially in Russia). This plugin allows to use the latest Swagger UI distribution and host it inside your app.

Usage

Installation

pip install fastapi-swagger

Basic Usage

from fastapi import FastAPI
from fastapi_swagger import patch_fastapi

app = FastAPI(docs_url=None, swagger_ui_oauth2_redirect_url=None)  # docs url will be at /docs

patch_fastapi(app)

How it works?

How it was before: FastAPI uses the get_swagger_ui_html function to render the Swagger UI under the hood.

def get_swagger_ui_html(
        *,
        openapi_url: str,
        title: str,
        swagger_js_url: str = "https://cdn.jsdelivr.net/npm/swagger-ui-dist@5/swagger-ui-bundle.js",
        swagger_css_url: str = "https://cdn.jsdelivr.net/npm/swagger-ui-dist@5/swagger-ui.css",
        swagger_favicon_url: str = "https://fastapi.tiangolo.com/img/favicon.png",
        oauth2_redirect_url: Optional[str] = None,
        init_oauth: Optional[Dict[str, Any]] = None,
        swagger_ui_parameters: Optional[Dict[str, Any]] = None,
) -> HTMLResponse:
    ...

How it is now:

Actually, we just copy the Swagger UI distribution from the GitHub releases to the fastapi_swagger package, and serve it from your app. Patch creates several additional routes with the Swagger UI resources and one route for docs page (btw, using same get_swagger_ui_html function).

def patch_fastapi(
        app: FastAPI,
        docs_url: str = "/docs",
        *,
        title: Optional[str],
        swagger_js_url: str = "/swagger/swagger-ui-bundle.js",  # relative path from app root
        swagger_css_url: str = "/swagger/swagger-ui.css",  # relative path from app root
        swagger_favicon_url: str = "/swagger/favicon-32x32.png",  # relative path from app root
        oauth2_redirect_url: Optional[str] = None,
        init_oauth: Optional[Dict[str, Any]] = None,
        swagger_ui_parameters: Optional[Dict[str, Any]] = None,
):
    ...


patch_fastapi(app)
# Now there are additional routes /swagger/swagger-ui-bundle.js, /swagger/swagger-ui.css, /swagger/favicon-32x32.png and /docs
# They all are not dependent on the external resources.

Project links

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Credits

Author: Ruslan Bel'kov

GitHub Statistics

Data verified by PyPI on Sep 5, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
View SPDX License List

Requires

Python ~=3.10

Classifiers

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