REST API with Chi router

You create a REST API with the Chi router by importing github.com/go-chi/chi/v5, defining a chi.Mux, registering routes with Handle or HandleFunc, and starting the server with http.ListenAndServe.

package main

import (
	"net/http"
	"github.com/go-chi/chi/v5"
)

func main() {
	r := chi.NewMux()
	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("Hello World"))
	})
	r.Get("/hello/{name}", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("Hello " + chi.URLParam(r, "name")))
	})
	http.ListenAndServe(":3000", r)
}

Chi is a lightweight tool that helps you organize the different web addresses (routes) your application responds to. It acts like a traffic director, sending requests to the correct function based on the URL pattern. You use it when you need a fast, simple way to build a web server in Go without heavy dependencies.