Nodejs Utililty Methods HTTP Server Create

var fs = require("fs"),
  http = require("http"),
  path = require("path"),
  querystring = require("querystring"),
  url = require("url");
var extensions = [".html",".ico",".css",".js",".img"];
String.prototype.endsWith = function(str){
  return this.substr(this.length - str.length) === str;
function isStaticResource(path){
  return extensions.some(function(extn){
    return path.endsWith(extn);
  });
var tasks = [
  {id : 1, name : "Learn jQuery", isCompleted : false},
  {id : 2, name : "Explore JavaScript", isCompleted : false},
  {id : 3, name : "Master AngularJs", isCompleted : false},
];
var server = http.createServer(function(req,res){
  var urlPath = url.parse(req.url).pathname
    filePath = path.join(__dirname,urlPath); 
  if (isStaticResource(filePath)){
    if (fs.existsSync(filePath)){
      console.log(filePath, " - served..");
      fs.createReadStream(filePath).pipe(res);
    } else {
      console.log(filePath, " - not found..");
      res.statusCode = 404;
      res.end();
  } else {
    if (urlPath === '/tasks'){
      setTimeout(function(){
        res.write(JSON.stringify(tasks));
        res.end();
      }, 1000);
});
server.listen(9090);
console.log("Server running on port 9090");