Socket.IO error 'listen()' method expects an 'http.Server' instance after moving to Express 3.0

Question

I began learning Node.js today and I\'m a little stuck.

Following this example, I get the following error when I try executing the js file:

Warning: expr         


        

Answer 1

There was a change to how you initialize express apps between versions 2 and 3. This example is based on version 2 but it looks like you've installed version 3. You just need to change a couple of lines to set up socket.io correctly. Change these lines:

var app = require('express').createServer(),
    io = require('socket.io').listen(app),
    scores = {};                                

// listen for new web clients:
app.listen(8080);

to this:

var express = require('express'),
    app = express()
  , http = require('http')
  , server = http.createServer(app)
  , io = require('socket.io').listen(server);

// listen for new web clients:
server.listen(8080);

Answer 2

Simplified to three lines of code that would be:

var server = require('http').createServer(require('express')()),
io = require('socket.io').listen(server);
server.listen(8080);