An open-source, browser-based interface that renders an OpenAPI spec as interactive, try-it-yourself API documentation. It has been the de facto standard for API docs since 2011.
Swagger UI takes an OpenAPI (or Swagger) JSON/YAML spec and renders it as a navigable docs page with every endpoint, parameter, schema, and example response. Most importantly, it lets developers execute real API calls from the docs (with auth) and see live responses, a dramatically faster feedback loop than reading static docs. Auto-included in FastAPI (at /docs), available as a standalone library, and embeddable in any docs site.
Pointing Swagger UI at a FastAPI backend's auto-generated OpenAPI spec, which gives instant interactive docs at /docs where internal devs can hit endpoints.
Swagger UI eliminates the gap between 'documented API' and 'working example', so devs can verify endpoint behavior without writing any client code.
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