Nodejs / Express - Launching my app: express.createServer() is deprecated

Question

I downloaded a node app to test and play around with. I have googled around and found that Express is found to be a little outdated. Can someone help me to fix the implement

Answer 1

I am already using the following snippet and it is working fine:

var express =require("express");
var http = require("http");

var app = express();
//app routers here 
...
var httpServer = http.Server(app);

httpServer.listen({PORT}, function(err){

});

Answer 2

var express = require('express');
var app = express();
app.listen(your_port_number);

With the newer release of express (express 4.x), you do not need to create server. app.listen internally does that. Refer https://expressjs.com/en/4x/api.html#app.listen

Answer 3

The solution is given in the error.

Warning: express.createServer() is deprecated, express applications no longer inherit from http.Server please use:

  var express = require("express");
  var app = express();

So you will have to just do this.

var express = require('express')
  , http = require('http');

var app = express(); 
var server = http.createServer(app);

Answer 4

Another potential solution to this is to install express 2.5.8 as a dependency.

Add to package.json:

    {
    "name": "authentication"
  , "version": "0.0.1"
  , "private": true
  , "dependencies": {
      "express": "2.5.8"
    , "jade": ">= 0.26.1"
  }
}

and then run

npm install

Answer 5

Its can done with this simple program:

var express = require('express');
var app = express();
app.get('/',
    function(req,res)
    {
        res.send("express");
    }
);
app.listen(3333);

it works fine.