fibgen generates a complete OpenAPI 3.1 / 3.0 spec for Go Fiber services — with zero annotations. No @Summary comments, no codegen, no changes to your handlers. Point it at your project and get paths, params, request bodies, per-status responses, and resolved type schemas ($ref, enums, nullables). Fiber handlers are opaque at runtime, so fibgen reads the code itself via go/types, recovering types from your c.Bind() and c.JSON() calls. Fiber v2 & v3. Open source, MIT