springdoc-openapi is a library that automatically generates OpenAPI 3 documentation for Spring Boot applications and integrates Swagger UI for interactive API exploration.
The library solves the problem of manually maintaining API documentation by automatically deriving OpenAPI specifications from Spring Boot controller annotations and configuration. It works by scanning Spring components at startup and generating machine-readable API contracts in JSON or YAML format, which Swagger UI then renders as interactive documentation. This approach keeps documentation synchronized with code changes without requiring developers to write specification files by hand.
Teams should adopt this tool if they are building REST APIs with Spring Boot and want to reduce the overhead of API documentation maintenance. It suits projects of any size that benefit from having discoverable, up-to-date API contracts. The library supports Spring Boot Web MVC, WebFlux with both annotated controllers and functional endpoints, Spring Data REST, Spring HATEOAS, and Spring Security. It handles error documentation through ControllerAdvice, OAuth2 security schemes, and can operate with a separate management port. The tool works with or without Swagger UI, allowing teams to generate specifications for programmatic consumption if preferred.
The project maintains a stable build and actively addresses security vulnerabilities. Development activity shows consistent engagement with community questions and issues across multiple channels. The codebase undergoes regular quality assessment and the project receives backing from multiple organizational sponsors.
