fastapi/docs/en/docs/reference/dependencies.md

Dependencies - Depends() and Security()

Depends()

Dependencies are handled mainly with the special function Depends() that takes a callable.

Here is the reference for it and its parameters.

You can import it directly from fastapi:

from fastapi import Depends

::: fastapi.Depends

Security()

For many scenarios, you can handle security (authorization, authentication, etc.) with dependencies, using Depends().

But when you want to also declare OAuth2 scopes, you can use Security() instead of Depends().

You can import Security() directly from fastapi:

from fastapi import Security

::: fastapi.Security