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Editorial Team
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Asked: 2026-06-12T02:37:28+00:00

I created a express 3 app with the express generator and installed socket.io. On

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I created a express 3 app with the express generator and installed socket.io.
On app.js im emiting a message:

io.sockets.on('connection', function(socket) {
  socket.emit('init', { msg: 'Welcome'});
});

At server side I wrote:

<!DOCTYPE html>
<html>
  <head>
    <title><%= title %></title>
    <link rel='stylesheet' href='/stylesheets/style.css' />
    <script src='/socket.io/socket.io.js' />
    <script>
        var socket = io.connect('http://127.0.0.1:3000');
        socket.on('init', function (data) {
            console.log(data.msg);
        });
    </script>
  </head>
  <body>
    <h1><%= title %></h1>
    <p>Welcome to <%= title %></p>
  </body>
</html>

If I run app.js It should print “Welcome” on the console, but its not priting anything. I checked if /socket.io/socket.io.js is accesed and it does.

When running the app I get:

  info  - socket.io started
Express server listening on port 3000
GET / 200 28ms - 472
GET /stylesheets/style.css 200 163ms - 110
   debug - served static content /socket.io.js

Am I missing something? I followed the socket.io webpage examples, but it seems that server is running fine… maybe something at the client-side?

EDIT: I also tried var socket = io.connect('http://127.0.0.1', { port: 3000 } ); on the client side, and also running all socket client side from the body.

Doing a console.log on the io.sockets.on event gave nothing… so “connection” is never reached.

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1 Answer

  1. Editorial Team

    adding a index.jade file to the example I posted before

    server.js

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

server.listen(3000)
io.set('loglevel',10) // set log level to get all debug messages
io.on('connection',function(socket){
  socket.emit('init',{msg:"test"})
})
app.get('/',function(req,res){
  res.render('index.jade')
})

    /views/index.jade

    doctype html
html
  head
    script(src="/socket.io/socket.io.js")
    script.
      var sockets = io.connect()
      sockets.on('init',function(msg){
        alert(msg.msg)
      })
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