Node.js fs read text file with error handler

var fs = require(fs);
var data = fs.readFileSync('input.txt');
console.log(data.toString());//from  ww  w.  j  a v  a2s. co m

fs.readFile('input.txt',function(err,data){
  if(err) return console.error(err);
  console.log(data.toString())
});

console.log("The program is end!!!");