Automatically generates OpenAPI 3 documentation for Spring Boot applications, including Swagger UI integration.
springdoc-openapi is a Java library that automatically generates OpenAPI 3 documentation for Spring Boot applications. It solves the problem of keeping API documentation in sync with code by inspecting the application at runtime, using Spring configurations and annotations to produce accurate, up-to-date API specs.
Java developers building REST APIs with Spring Boot who need automated, compliant OpenAPI documentation and interactive API exploration via Swagger UI.
Developers choose springdoc-openapi for its seamless integration with Spring Boot, automatic inference of API semantics, and out-of-the-box Swagger UI deployment, eliminating manual documentation maintenance and ensuring consistency between code and docs.
Library for OpenAPI 3 with spring-boot
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Infers API semantics at runtime from Spring Boot configurations and annotations, reducing manual effort and ensuring docs stay synchronized with code changes.
Works with Spring Web MVC, WebFlux, HATEOAS, Spring Cloud Function, and supports JSR-303 validation and OAuth 2 security schemes, as highlighted in the README.
Automatically deploys an interactive Swagger UI for API exploration and testing with minimal configuration, just by adding the dependency.
Fully supports Spring Boot v3 with Java 17 and Jakarta EE 9, and is compatible with GraalVM native images for modern deployment scenarios.
For Spring Boot 2.x, extended support beyond v1.8.0 requires payment, which can be a barrier for organizations with legacy projects unwilling to upgrade or pay.
When Spring Security is enabled, explicit configuration is needed to permit access to documentation endpoints, adding overhead to secure setups, as noted in the README.
Documentation is generated at runtime, so it's unavailable without a running application, limiting static analysis or pre-deployment documentation generation.