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FastAPI Dependencies

FastAPI's dependency injection system, exposed via Depends() and Security().

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Field note

What it does

Reference for FastAPI dependency injection: Depends() takes a callable and Security() adds security declarations.

Capabilities

Available capabilities

Dependency Injection Dependency caching Security Dependencies Sub-dependencies

Tags

Tags

Web framework Python Dependency Injection

Ways to use it

Ways to use it

sdk

python / fastapi

pypi

python / fastapi

Product features

Product features

dependency_overrides instance-attribute ¶

Depends()

Declares a FastAPI dependency from a dependable callable; supports use_cache and scope.

Example ¶

FastAPI class ¶

fastapi.FastAPI ¶

frontend ¶

get ¶

include_router ¶

openapi ¶

openapi_version instance-attribute ¶

Security()

Declares security dependencies in FastAPI.

state instance-attribute ¶

webhooks instance-attribute ¶

websocket ¶