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Build fast. Run fast.

Accelerate your web app development

⚡ The lightning-fast asynchronous Python web framework#

Simple and lightweight#

Intuitive API with smart defaults and no bloat allows you to get straight to work building your app.

Unopinionated and flexible#

Build the way you want to build without letting your tooling constrain you.

Performant and scalable#

Built from the ground up with speed and scalability as a main concern. It is ready to power web applications big and small.

Production ready#

Out of the box, it comes bundled with a web server ready to power your web applications.

Trusted by millions#

Sanic is one of the overall most popular frameworks on PyPI, and the top async enabled framework

Community driven#

The project is maintained and run by the community for the community.

With the features and tools you'd expect.

And some you wouldn't believe.

  • Production-grade

    After installing, Sanic has all the tools you need for a scalable, production-grade server—out of the box!

    Including full TLS support.

    from sanic import Sanic
    from sanic.response import text
    app = Sanic("MyHelloWorldApp")
    async def hello_world(request):
        return text("Hello, world.")
    [2023-01-31 12:34:56 +0000] [999996] [INFO] Sanic v22.12.0
    [2023-01-31 12:34:56 +0000] [999996] [INFO] Goin' Fast @
    [2023-01-31 12:34:56 +0000] [999996] [INFO] mode: production, single worker
    [2023-01-31 12:34:56 +0000] [999996] [INFO] server: sanic, HTTP/1.1
    [2023-01-31 12:34:56 +0000] [999996] [INFO] python: 3.10.9
    [2023-01-31 12:34:56 +0000] [999996] [INFO] platform: SomeOS-9.8.7
    [2023-01-31 12:34:56 +0000] [999996] [INFO] packages: sanic-routing==22.8.0
    [2023-01-31 12:34:56 +0000] [999997] [INFO] Starting worker [999997]
  • TLS server

    Running Sanic with TLS enabled is as simple as passing it the file paths...

    sanic --cert=/path/to/bundle.crt --key=/path/to/privkey.pem

    ... or the a directory containing fullchain.pem and privkey.pem

    sanic --tls=/path/to/certs

    Even better, while you are developing, let Sanic handle setting up local TLS certificates so you can access your site over TLS at https://localhost:8443

    sanic --dev --auto-tls
  • Websockets

    Up and running with websockets in no time using the websockets package.

    from sanic import Request, Websocket
    async def feed(request: Request, ws: Websocket):
        async for msg in ws:
            await ws.send(msg)
  • Static files

    Serving static files is of course intuitive and easy. Just name an endpoint and either a file or directory that should be served.

    app.static("/", "/path/to/index.html")
    app.static("/uploads/", "/path/to/uploads/")

    Moreover, serving a directory has two additional features: automatically serving an index, and automatically serving a file browser.

    Sanic can automatically serve index.html (or any other named file) as an index page in a directory or its subdirectories.


    And/or, setup Sanic to display a file browser.


  • Lifecycle

    Beginning or ending a route with functionality is as simple as adding a decorator.

    async def add_key(request): = "bar"
    async def custom_banner(request, response):
        response.headers["X-Foo"] =

    Same with server events.

    async def setup_db(app):
        app.ctx.db_pool = await db_setup()
    async def setup_db(app):
        await app.ctx.db_pool.shutdown()

    But, Sanic also allows you to tie into a bunch of built-in events (called signals), or create and dispatch your own.

    @app.signal("http.lifecycle.complete")  # built-in
    async def my_signal_handler(conn_info):
        print("Connection has been closed")
    @app.signal("something.happened.ohmy")  # custom
    async def my_signal_handler():
        print("something happened")
    await app.dispatch("something.happened.ohmy")
  • Smart error handling

    Raising errors will intuitively result in proper HTTP errors:

    raise sanic.exceptions.NotFound  # Automatically responds with HTTP 404

    Or, make your own:

    from sanic.exceptions import SanicException
    class TeapotError(SanicException):
        status_code = 418
        message = "Sorry, I cannot brew coffee"
    raise TeapotError

    And, when an error does happen, Sanic's beautiful DEV mode error page will help you drill down to the bug quickly.


    Regardless, Sanic comes with an algorithm that attempts to respond with HTML, JSON, or text-based errors as appropriate. Don't worry, it is super easy to setup and customize your error handling to your exact needs.

  • App Inspector

    Check in on your live, running applications (whether local or remote).

    sanic inspect      
    │                                                        Sanic                                                        │
    │                                          Inspecting @ http://localhost:6457                                         │
    │                            mode: production, single worker                                                         │
    │     ▄███ █████ ██        server: unknown                                                                           │
    │    ██                    python: 3.10.9                                                                            │
    │     ▀███████ ███▄      platform: SomeOS-9.8.7
    │                 ██     packages: sanic==22.12.0, sanic-routing==22.8.0, sanic-testing==22.12.0, sanic-ext==22.12.0 │
    │    ████ ████████▀                                                                                                  │
    │                                                                                                                    │
    │ Build Fast. Run Fast.                                                                                              │
        pid: 999996
        server: True
        state: ACKED
        pid: 999997
        start_at: 2023-01-31T12:34:56.00000+00:00
        starts: 1
        server: False
        state: STARTED
        pid: 999998
        start_at: 2023-01-31T12:34:56.00000+00:00
        starts: 1

    And, issue commands like reload, shutdown, scale...

    sanic inspect scale 4

    ... or even create your own!

    sanic inspect migrations
  • Extendable

    In addition to the tools that Sanic comes with, the officially supported Sanic Extensions provides lots of extra goodies to make development easier.

    • CORS protection
    • Template rendering with Jinja
    • Dependency injection into route handlers
    • OpenAPI documentation with Redoc and/or Swagger
    • Predefined, endpoint-specific response serializers
    • Request query arguments and body input validation
    • Auto create HEAD, OPTIONS, and TRACE endpoints
    • Live health monitor
  • Developer Experience

    Sanic is built for building.

    From the moment it is installed, Sanic includes helpful tools to help the developer get their job done.

    • One server - Develop locally in DEV mode on the same server that will run your PRODUCTION application
    • Auto reload - Reload running applications every time you save a Python file, but also auto-reload on any arbitrary directory like HTML template directories
    • Debugging tools - Super helpful (and beautiful) error pages that help you traverse the trace stack easily
    • Auto TLS - Running a localhost website with https can be difficult, Sanic makes it easy
    • Streamlined testing - Built-in testing capabilities, making it easier for developers to create and run tests, ensuring the quality and reliability of their services
    • Modern Python - Thoughtful use of type hints to help the developer IDE experience