Parsing JSON in a request body with Go

gistfile1.go

package main

import (
	"encoding/json"
	"io/ioutil"
	"log"
	"net/http"
)

type Message struct {
	Id   int64  `json:"id"`
	Name string `json:"name"`
}

// curl localhost:8000 -d '{"name":"Hello"}'
func Cleaner(w http.ResponseWriter, r *http.Request) {
	// Read body
	b, err := ioutil.ReadAll(r.Body)
	defer r.Body.Close()
	if err != nil {
		http.Error(w, err.Error(), 500)
		return
	}

	// Unmarshal
	var msg Message
	err = json.Unmarshal(b, &msg)
	if err != nil {
		http.Error(w, err.Error(), 500)
		return
	}

	output, err := json.Marshal(msg)
	if err != nil {
		http.Error(w, err.Error(), 500)
		return
	}
	w.Header().Set("content-type", "application/json")
	w.Write(output)
}

func main() {
	http.HandleFunc("/", Cleaner)
	address := ":8000"
	log.Println("Starting server on address", address)
	err := http.ListenAndServe(address, nil)
	if err != nil {
		panic(err)
	}
}

Thank you! Great discussion here everyone.

@aodin , thank you for the original post, and great writing for your response to handling the defer resp.Body.Close(). I found it to be enlightening in more ways that just an analysis of Go.

@ikrauchanka , thank you for noting to use decoder instead of unmarshal.

@tzachshabtay , thank you for being honest and sticking to your guns about your stance on the un-handled errors. Without that then there wouldn't have been as many chances to learn.

Have a great day peoples! :)