socket.on('connection' ... event never fired nodejs + express + socket.io

Question

Problem socket.io NOT working

Details

• Generated a project with express [folder]; cd [folder]; npm install;
• Setup socket.io npm install socket.io
• Run node app with below code
• Client connect event fires but server connection NEVER fired.

Setup

• Server AWS Free Tier, Ubuntu 11.10, ami-a7f539ce
• nodejs v0.6.5
• express v2.5.1
• socket.io v0.8.7

Client

 var socket = io.connect('http://example.com:3000');

 socket.on('connect', function() { 
    console.log('connected');
 });

 socket.on('message', function(msg){
    console.log(msg);
 });

 socket.on('disconnect', function() {
    console.log('disconnected');
 });

 socket.on('error', function (e) {
    console.log('System', e ? e : 'A unknown error occurred');
 });

Server

 [...]

 app.listen(3000);

 // socket.io setup
 var socket = require('socket.io').listen(app);

 // socket.io connection establishment
 socket.on('connection', function (client) {
    client.send("hello");
    console.log("hello", client);           
 });

Why is connection event never fired?

Answer 1

Took a while to notice... the connection event is emmited on io.sockets. In your code this would be

socket.sockets.on('connection', function (client) {
  client.send("hello")
  console.log("hello", client)
})

You should use io instead of socket as the var name to avoid this confusion.