FastAPI
Modern, fast Python web framework for building APIs with automatic OpenAPI docs and type validation.
Version: v0.111
Official Documentation ↗Installation
pip
pip install fastapi uvicornMethods
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FAQ
- How does FastAPI compare to Flask?
- FastAPI provides automatic type validation, OpenAPI/Swagger docs, and async support out of the box. Flask requires extensions for these features. FastAPI is also faster, benchmarking at par with NodeJS and Go frameworks.
- What is the ASGI server requirement?
- FastAPI requires an ASGI server like Uvicorn (dev) or Hypercorn/Gunicorn with uvicorn worker (prod). This enables async/await support for concurrent request handling and WebSockets.
- How do I handle database connections?
- Use SQLAlchemy 2.0 with async sessions, or SQLModel (built on Pydantic + SQLAlchemy). For NoSQL, Motor (MongoDB) or Redis async. Dependency injection manages connection lifecycle per request.
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