High Performance Go API Framework

A high-performance, minimalist web framework for building Go APIs with a zero-allocation radix tree router, batteries-included middleware, and an expressive API that enables shipping production services in minutes. Currently at version 5.2.1 with over 32,500 GitHub stars, the framework achieves zero dynamic memory allocation per request through its optimized routing engine, making it suitable for high-throughput API gateways and microservices where garbage collection pauses must be minimized. The router uses a radix tree data structure for path matching, supporting dynamic path parameters, wildcard matching, and route grouping with nested middleware chains that can be composed without performance overhead. Over 25 built-in middleware functions cover common requirements including CORS configuration with preflight handling, JWT authentication with claims extraction, rate limiting with token bucket and fixed window algorithms, gzip response compression, panic recovery with custom error handlers, request and response logging with structured output, secure headers injection, and request ID propagation for distributed tracing. Data binding automatically parses JSON, XML, form data, query parameters, and path parameters into typed Go structs using reflection, with integrated validation through struct tags or custom validators. Automatic TLS provisioning integrates with Let Encrypt certificate generation for zero-configuration HTTPS, with HTTP/2 support enabled by default. Template rendering supports any Go template engine through a configurable renderer interface. The ecosystem includes official packages for JWT authentication, Prometheus metrics export, Jaeger and Zipkin tracing integration, Casbin authorization, and Swagger OpenAPI documentation generation. Sponsored by teams building Go-based cloud backends, the framework maintains a clean migration path across major versions with deprecation warnings and compatibility shims.