Swagger UI is an open-source tool that generates interactive API documentation from OpenAPI specification files, supporting versions including OpenAPI 3.0 and 3.1. Developers use it to automatically create user-friendly, browsable documentation that allows users to test API endpoints directly from the documentation interface. It works with REST APIs and eliminates the need to manually maintain separate documentation by deriving it from your API specification.

1,470 open issues · last updated Jul 22, 2026