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FastAPI

Verified Sep 2026

Modern, Fast Web Framework for Building APIs with Python

A high-performance API framework for Python, based on standard Python type hints. Automatic OpenAPI docs, async support, and type safety.

Sebastian Ramírez's 2018 framework made Python web development modern: type hints drive validation (Pydantic), docs (OpenAPI/Swagger generated automatically) and editor support. Async-native and fast. It became the standard backend for AI services and the friendliest way to expose an ML model as an API.

Who it's for

Python teams building typed, async APIs with automatic OpenAPI docs, popular in AI and data products.

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