Node download list of files

var fs = require('fs');
var http = require('http');

var ROOT = '/';

var dataString1 = "img1,img2,img3";

function download(list, index){
  var file = list[index].trim();
  var url = ROOT + file;

  var writeStream = fs.createWriteStream( './' + file);


   http.get(url, function(response){
    response.pipe(writeStream);
    console.log(file, 'Done \n');

    if( list.length > index ){
      download(list, ++index);
    }
  });
}

download(data1, 0);