Self-documenting APIs for Go's net/http: wrap your ServeMux and it serves a /docs UI (Scalar, Swagger UI, Redoc, Stoplight) plus the generated OpenAPI 3.0/3.1/3.2 spec. Zero dependencies.
APISpec - Generate OpenAPI 3.1 specs from Go code with intelligent framework detection and call graph analysis. Supports Gin, Echo, Chi, Fiber, and net/http.