A Java-based OpenAPI 3 parser, JSON schema validator, and request/response validator for API tooling.
OpenAPI4j is a Java-based toolkit for parsing, validating, and working with OpenAPI 3.0 specifications. It provides modules for schema validation, request/response validation, and JSON reference handling, helping developers ensure API compliance and correctness. The project supports the JVM platform, including Jakarta, and is compatible with native compilation via GraalVM.
Java developers building or consuming RESTful APIs who need robust OpenAPI specification validation and tooling. It's particularly useful for teams implementing API-first design or requiring automated validation in CI/CD pipelines.
Developers choose OpenAPI4j for its comprehensive OpenAPI 3.0 support, modular architecture, and performance optimizations like GraalVM native compatibility. It offers a reliable, standards-focused alternative to manual validation, reducing errors in API implementations.
OpenAPI 3 parser, JSON schema and request validator.
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Separated into focused modules like parser, validator, and adapters, allowing flexible integration into existing Java projects without unnecessary dependencies.
Supports schema, request, and response validation against OpenAPI 3.0 specs, enabling full API compliance and error reduction in automated testing.
Fully compatible with GraalVM for native compilation, though the README notes limited performance improvements outside the parser module.
Emphasizes adherence to OpenAPI 3.0 standards with robust JSON reference handling and validation mechanisms for reliable API tooling.
The repository is archived with no active maintenance, meaning no bug fixes, security updates, or new feature development.
Only supports OpenAPI 3.0.x, with no plans for 3.1.x in version 1, making it outdated for teams adopting newer OpenAPI versions.
GraalVM native compilation offers little performance improvement for most modules, as noted in the README, reducing its value for performance-critical applications.