FastAPI Python

FastAPI is a modern, fast (high-performance) Python web framework for building APIs. It's built on ASGI (Asynchronous Server Gateway Interface) and uses async/await for high concurrency. FastAPI auto-generates OpenAPI (Swagger) documentation from type hints—no manual docs needed. Validation is via Pydantic models—request data validated automatically against schema. The developer experience is exceptional: define a model with types, FastAPI handles validation, serialization, documentation. Reduces boilerplate 80% vs. Flask or Django.