FastAPI

FastAPI is a modern Python web framework built on Starlette (ASGI) and Pydantic (validation). Install with pip install "fastapi[standard]".

Architecture

FastAPI (routing, OpenAPI, DI) -> Starlette (ASGI, middleware, responses) -> Uvicorn (ASGI server)
                                  Pydantic (validation, serialization)

• Starlette: provides Request, Response, WebSocket, middleware, TestClient, StaticFiles
• Pydantic: provides BaseModel, Field, validation, serialization
• Uvicorn: ASGI server (fastapi run or uvicorn app:app)

Quick Start