show mux routes

main.go

package main

import (
	"encoding/json"
	"log"
	"net/http"

	"github.com/gorilla/mux"
)

type RoutesResponse struct {
	Routes []string `json:"routes"`
}

type Service struct {
	Router *mux.Router
}

func (s *Service) handler(w http.ResponseWriter, r *http.Request) {
	return
}

func (s *Service) routes(w http.ResponseWriter, r *http.Request) {

	routes := []string{}

	s.Router.Walk(func(route *mux.Route, router *mux.Router, ancestors []*mux.Route) error {
		t, err := route.GetPathTemplate()
		if err != nil {
			return err
		}
		log.Println(t)

		routes = append(routes, t)

		return nil
	})

	js, _ := json.Marshal(RoutesResponse{
		Routes: routes,
	})

	w.Header().Set("Content-Type", "application/json")
	w.Write(js)

	return
}

func main() {

	service := Service{
		Router: mux.NewRouter(),
	}

	service.Router.HandleFunc("/articles", service.handler).Methods("GET")
	service.Router.HandleFunc("/articles/{id}", service.handler).Methods("GET")
	service.Router.HandleFunc("/routes", service.routes).Methods("GET")

	log.Printf("running ...")
	log.Fatal(http.ListenAndServe(":8080", service.Router))
}

curl localhost:8080/routes | python -m json.tool
{
    "routes": [
        "/articles",
        "/articles/{id}",
        "/routes"
    ]
}