sanic/guide/content/en/plugins/sanic-ext/openapi/basics.md

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# Basics
.. note::
The OpenAPI implementation in Sanic Extensions is based upon the OAS3 implementation from [`sanic-openapi`](https://github.com/sanic-org/sanic-openapi). 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.
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Out of the box, Sanic Extensions provides automatically generated API documentation using the [v3.0 OpenAPI specification](https://swagger.io/specification/). There is nothing special that you need to do
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```python
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:
- [http://localhost:8000/docs](http://localhost:8000/docs)
- [http://localhost:8000/docs/redoc](http://localhost:8000/docs/redoc)
- [http://localhost:8000/docs/swagger](http://localhost:8000/docs/swagger)
Checkout the [section on configuration](../configuration.md) 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.
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Using [Redoc](https://github.com/Redocly/redoc)
![Redoc](/assets/images/sanic-ext-redoc.png)
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or [Swagger UI](https://github.com/swagger-api/swagger-ui)
![Swagger UI](/assets/images/sanic-ext-swagger.png)
## Changing specification metadata
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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.
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```python
from textwrap import dedent
app.ext.openapi.describe(
"Testing API",
version="1.2.3",
description=dedent(
"""
# Info
This is a description. It is a good place to add some _extra_ doccumentation.
**MARKDOWN** is supported.
"""
),
)
```