node js download file to folder

1var http = require('http');
2var fs = require('fs');
3
4var download = function(url, dest, cb) {
5  var file = fs.createWriteStream(dest);
6  var request = http.get(url, function(response) {
7    response.pipe(file);
8    file.on('finish', function() {
9      file.close(cb);  // close() is async, call cb after close completes.
10    });
11  }).on('error', function(err) { // Handle errors
12    fs.unlink(dest); // Delete the file async. (But we don't check the result)
13    if (cb) cb(err.message);
14  });
15};