Chi-like syntactic sugar layer on top of stdlib http.ServeMux

This code defines a lightweight router in Go that adds a Chi-like syntactic sugar layer on top of the standard library's `http.ServeMux`. It provides method-specific routing (GET, POST, PUT, DELETE, etc.), middleware chaining with `Use()`, and route grouping via `Group()`, while wrapping handlers with middleware in the correct order. The included example demonstrates creating a router with global middleware, grouped routes with additional middleware, and per-route middleware.

chi.go This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters Show hidden characters // Chi-like syntactic sugar layer on top of stdlib http.ServeMux. package main import "net/http" "slices" type middleware func http.Handler http.Handler router struct { http.ServeMux chain middleware } func NewRouter mx ...middleware router { return &router{ServeMux: &http.ServeMux{}, chain: mx} } func r router Use mx ...middleware { r.chain = append r.chain, mx... } func r router Group fn func r router { fn &router{ServeMux: r.ServeMux, chain: slices.Clone r.chain } } func r router Get path string, fn http.HandlerFunc, mx ...middleware { r.handle http.MethodGet, path, fn, mx } func r router Post path string, fn http.HandlerFunc, mx ...middleware { r.handle http.MethodPost, path, fn, mx } func r router Put path string, fn http.HandlerFunc, mx ...middleware { r.handle http.MethodPut, path, fn, mx } func r router Delete path string, fn http.HandlerFunc, mx ...middleware { r.handle http.MethodDelete, path, fn, mx } func r router Head path string, fn http.HandlerFunc, mx ...middleware { r.handle http.MethodHead, path, fn, mx } func r router Options path string, fn http.HandlerFunc, mx ...middleware { r.handle http.MethodOptions, path, fn, mx } func r router handle method, path string, fn http.HandlerFunc, mx middleware { r.Handle method+" "+path, r.wrap fn, mx } func r router wrap fn http.HandlerFunc, mx middleware out http.Handler { out, mx = http.Handler fn , append slices.Clone r.chain , mx... slices.Reverse mx for , m := range mx { out = m out } return } example.go This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters Show hidden characters package main import "fmt" "log" "net/http" func mid i int middleware { return func next http.Handler http.Handler { return http.HandlerFunc func w http.ResponseWriter, r http.Request { fmt.Println "mid", i, "start" next.ServeHTTP w, r fmt.Println "mid", i, "done" } } } func someHandler w http.ResponseWriter, r http.Request { fmt.Println " the handler ran here " fmt.Fprintln w, "Hello world of", r.URL.Path } func main { r := NewRouter mid 0 r.Group func r router { r.Use mid 1 , mid 2 r.Get "/foo", someHandler } r.Group func r router { r.Use mid 3 r.Get "/bar", someHandler, mid 4 r.Get "/baz", someHandler, mid 5 } r.Post "/foobar", someHandler log.Fatal http.ListenAndServe ":3000", r }