FastAPI

Python web framework for APIsOpen source· verified Sep 2026

Builds HTTP APIs from Python type hints: requests are validated automatically, and an OpenAPI schema with interactive docs is generated for free. Supports async handlers.

Official site

Reach for it when

Python APIs next to data or ML code
APIs that need generated docs and typed clients

In stack playbooks

FastAPI + Postgres + SQLAlchemy

HTTP framework, validation, OpenAPI docs

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