Parsing JSON files With Golang

main.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"
	"strconv"
)

// Users struct which contains
// an array of users
type Users struct {
	Users []User `json:"users"`
}

// User struct which contains a name
// a type and a list of social links
type User struct {
	Name   string `json:"name"`
	Type   string `json:"type"`
	Age    int    `json:"Age"`
	Social Social `json:"social"`
}

// Social struct which contains a
// list of links
type Social struct {
	Facebook string `json:"facebook"`
	Twitter  string `json:"twitter"`
}

func main() {

	// Open our jsonFile
	jsonFile, err := os.Open("users.json")
	// if we os.Open returns an error then handle it
	if err != nil {
		fmt.Println(err)
	}

	fmt.Println("Successfully Opened users.json")
	// defer the closing of our jsonFile so that we can parse it later on
	defer jsonFile.Close()

	// read our opened xmlFile as a byte array.
	byteValue, _ := ioutil.ReadAll(jsonFile)

	// we initialize our Users array
	var users Users

	// we unmarshal our byteArray which contains our
	// jsonFile's content into 'users' which we defined above
	json.Unmarshal(byteValue, &users)

	// we iterate through every user within our users array and
	// print out the user Type, their name, and their facebook url
	// as just an example
	for i := 0; i < len(users.Users); i++ {
		fmt.Println("User Type: " + users.Users[i].Type)
		fmt.Println("User Age: " + strconv.Itoa(users.Users[i].Age))
		fmt.Println("User Name: " + users.Users[i].Name)
		fmt.Println("Facebook Url: " + users.Users[i].Social.Facebook)
	}

}

users.json

{
  "users": [
    {
      "name" : "Elliot",
      "type" : "Reader",
      "age" : 23,
      "social" : {
        "facebook" : "https://facebook.com",
        "twitter" : "https://twitter.com"
      }
    },
    {
      "name" : "Fraser",
      "type" : "Author",
      "age" : 17,
      "social" : {
        "facebook" : "https://facebook.com",
        "twitter" : "https://twitter.com"
      }
    }
  ]
}