Node.js fs watchFile()

var fs = require("fs");
console.log("Started");
var config = JSON.parse(fs.readFileSync("./files/config.json"));
console.log("Initial config: ", config);

fs.watchFile("./files/config.json", function(current, previous){
  console.log("Config changed");
  config = JSON.parse(fs.readFileSync("./files/config.json"));
  console.log("New config file: ", config);
});/*from www .  j a v  a2  s  .com*/