# Basics

Side note

The OpenAPI implementation in Sanic Extensions is based upon the OAS3 implementation from sanic-openapi (opens new window). In fact, Sanic Extensions is in a large way the successor to that project, which entered maintenance mode upon the release of Sanic Extensions. If you were previously using OAS3 with sanic-openapi you should have an easy path to upgrading to Sanic Extensions. Unfortunately, this project does NOT support the OAS2 specification.

Out of the box, Sanic Extensions provides automatically generated API documentation using the v3.0 OpenAPI specification (opens new window). There is nothing special that you need to do

from sanic import Sanic
app = Sanic("MyApp")
# Add all of your views

After doing this, you will now have beautiful documentation already generated for you based upon your existing application:

Checkout the section on configuration to learn about changing the routes for the docs. You can also turn off one of the two UIs, and customize which UI will be available on the /docs route.

# Changing specification metadata

If you want to change any of the metada, you should use the describe method.

In this example dedent is being used with the description argument to make multi-line strings a little cleaner. This is not necessary, you can pass any string value here.

from textwrap import dedent
    "Testing API",
        # Info
        This is a description. It is a good place to add some _extra_ doccumentation.
        **MARKDOWN** is supported.
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