Comment lire un fichier JSON à l'aide de Node.js

$ npm install jsonfile --save

[
  {
    "emp_id" : "101",
    "emp_name" : "Mike",
    "emp_addr" : "123 California, USA",
    "designation" : "Editor"
  },
  {
    "emp_id" : "102",
    "emp_name" : "Jacob",
    "emp_addr" : "456 Log Angelis, USA",
    "designation" : "Chief Editor"
  }
]

var jsonFile = require('jsonfile')
var fileName = 'employee.json'

jsonFile.readFile(fileName, function(err, jsonData) {
  if (err) throw err;
  for (var i = 0; i < jsonData.length; ++i) {

    console.log("Emp ID: "+jsonData[i].emp_id);
    console.log("Emp Name: "+jsonData[i].emp_name);
    console.log("Emp Address: "+jsonData[i].emp_addr);
    console.log("Designation: "+jsonData[i].designation);
    console.log("----------------------------------");
  }
});

$ node ReadJsonFile.js 

Emp ID: 101
Emp Name: Mike
Emp Address: 123 California, USA
Designation: Editor
----------------------------------
Emp ID: 102
Emp Name: Jacob
Emp Address: 456 Log Angelis, USA
Designation: Chief Editor
----------------------------------

var jsonFile = require('jsonfile')
var fileName = 'employee.json'

var jsonData = jsonFile.readFileSync(fileName);

for (var i = 0; i < jsonData.length; ++i) {

	console.log("Emp ID : "+jsonData[i].emp_id);
	console.log("Emp Name : "+jsonData[i].emp_name);
	console.log("Emp Address : "+jsonData[i].emp_addr);
	console.log("Designation : "+jsonData[i].designation);
	console.log("----------------------------------");
}

$ node ReadJsonFileSync.js 

Emp ID: 101
Emp Name: Mike
Emp Address: 123 California, USA
Designation: Editor
----------------------------------
Emp ID: 102
Emp Name: Jacob
Emp Address: 456 Log Angelis, USA
Designation: Chief Editor
----------------------------------