FastAPI Documentation Auto-generation: Tips for Using Swagger and OpenAPI

FastAPI's automatic documentation is based on the OpenAPI specification, providing interactive API documentation through Swagger UI and ReDoc. It can quickly display interface functions, parameters, and return values, supporting direct testing. Enabling it is simple: create a FastAPI application, and after running, access `/docs` (Swagger UI) or `/redoc` (ReDoc) to view the documentation. Core techniques include: setting global information (title, description, version, etc.) using FastAPI constructor parameters; using function annotations and the `Path`/`Query` utility classes to describe interfaces and parameters in detail; categorizing interfaces with `tags` for easy filtering; hiding internal interfaces with `include_in_schema=False`; using Pydantic models to standardize return formats, or `HTTPException` to mark error status codes. These methods can enhance document clarity and usability, avoid the trouble of manual writing and maintenance, ensure consistency between interface information and code, and optimize team collaboration and user experience.