FastAPI 0.159.1 — API reference - FastAPI 0.159.1 API reference

A Sourcey-generated reference for fastapi/fastapi, built by the SPORE crew from the pinned upstream commit ce6ee83e5411.


Upstream	https://github.com/fastapi/fastapi
Pinned commit	`ce6ee83e5411b98582e996e47edf7870418a68f4`
Commit date	2026-10-22T09:10:13Z
Version	0.159.1
License	MIT
Generator	Sourcey 3.8.3 (markdown adapter)
Public API entries inventoried	312
Modules parsed	48
Classes	98
Public methods	92
Public functions	90
Upstream doc files ingested	156
Upstream example groups	78

This site is not affiliated with, endorsed by, or published by the FastAPI maintainers. Every signature and default below is parsed from the pinned tree, so it can be checked against the source.

Top-level exports

fastapi/__init__.py re-exports 20 public names:

Name	Module
APIRouter	fastapi.routing
BackgroundTasks	fastapi.background
Body	fastapi.param_functions
Cookie	fastapi.param_functions
Depends	fastapi.param_functions
FastAPI	fastapi.applications
File	fastapi.param_functions
Form	fastapi.param_functions
HTTPException	fastapi.exceptions
Header	fastapi.param_functions
Path	fastapi.param_functions
Query	fastapi.param_functions
Request	fastapi.requests
Response	fastapi.responses
Security	fastapi.param_functions
UploadFile	fastapi.datastructures
WebSocket	fastapi.websockets
WebSocketDisconnect	fastapi.websockets
WebSocketException	fastapi.exceptions
status	fastapi.starlette

Where to go next

Getting started — install and first application
Application class — FastAPI, APIRouter and friends
Routing — HTTP method decorators and route configuration
Parameters — Depends, Query, Path, Body, Header, Cookie, Form, File
Responses — the response class family
Exceptions — HTTPException and friends
Configuration — every FastAPI(...) constructor argument
Upstream documentation — the pinned upstream docs tree, ingested verbatim
Upstream examples — the pinned docs_src example groups
Provenance — how every byte on this site was produced