description FastAPI Stack Overview
FastAPI is an open source Python framework created by Sebastián Ramírez for building web APIs. Released in 2018, it is built on Starlette for web functionality and Pydantic for data validation, serialization, and schema handling. It uses standard Python type hints to define request and response data, supports asynchronous endpoint functions, and automatically generates OpenAPI specifications with interactive API documentation.
help FastAPI Stack FAQ
How do FastAPI, Starlette, and Pydantic divide the work in a FastAPI stack?
FastAPI uses Starlette for web features such as routing and ASGI handling, while Pydantic validates and serializes data. FastAPI connects both layers to standard Python type hints and generates an OpenAPI schema from the resulting endpoint definitions.
Does FastAPI generate Swagger documentation automatically?
Yes. A standard FastAPI application exposes interactive Swagger UI documentation at /docs and ReDoc at /redoc unless those routes are changed or disabled.
Should a FastAPI application run directly in production?
FastAPI is the framework, so it normally runs through an ASGI server such as Uvicorn. Production deployments may add multiple workers, a reverse proxy such as Nginx, or a container platform depending on traffic and infrastructure.
What changed for FastAPI projects when Pydantic 2 arrived?
Pydantic 2 changed several validation APIs and model methods, so older FastAPI projects may need migration work. FastAPI added compatibility support, but applications should test schemas, validators, and serialization before replacing a Pydantic 1 dependency.
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