How Pydantic and Type Hints Power FastAPI's Data Validation and API Docs

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A DEV Community article explains how FastAPI validates incoming data and generates API documentation with minimal code. The key tools are Python type hints and Pydantic, which together handle type conversion and validation. Pydantic can convert compatible values, such as turning the string "101" into an integer, and raises a validation error when conversion fails. Type hints on function parameters tell FastAPI what to expect, so invalid path parameters are rejected automatically. FastAPI then uses these hints and models to produce interactive documentation at /docs, /redoc, and an OpenAPI schema.

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