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branch: master over Node.js / Demo npm downloads over node.js for webrtc-signaling!

Install via npm

npm install socketio-over-nodejs

and run the signaler.js nodejs file:

// run simple HTTP server
node ./node_modules/socketio-over-nodejs/signaler.js

// run HTTPs server
node ./node_modules/socketio-over-nodejs/signaler-ssl.js

Now you can test: http://localhost:8888/ or https://localhost:8888/

You can use ip-address 127.1.1 on Mac/Linux instead of localhost.

Install on Linux/Ubuntu/CentOS/Debian/Mac etc.

# create a directory
mkdir socketio-over-nodejs

# open directory
cd socketio-over-nodejs

# get package

# extract package
tar -xf socketio-over-nodejs.tar

# run simple node.js server
node signaler.js

# run HTTPs server
node signaler-ssl.js

Now, you can open port 8888 on your ip address/domain; or otherwise on localhost: http://localhost:8888/

It is using port 8888; you can edit this port using following commands:

vi signaler.js

# now edit port 8888
# and save changes & quit

# press "insert" key; then press "Esc" key and the type

:wq command saves changes in the file and exits editing mode. If you don't want to save changes; simply type:

# if you don't want to save changes however want to exit editing mode

Common Error: Error: listen EADDRINUSE. It means that same port is used by another application. You can close all existing processes running on same port:

// list all active processes running on same port
fuser -v 8888/tcp

// kill all processes running on port "8888"
fuser -vk 8888/tcp

// list again to verify closing ports
fuser -v 8888/tcp

You can delete "directory" and re-install:

rm -rf socketio-over-nodejs
mkdir socketio-over-nodejs

# and following above steps to "wget" and "tar" then "node" to run!


Otherwise, follow these steps:

  1. Download and extract ZIP file of this repository then copy folder-location of thesignaler.js file
  2. Open Node.js command prompt window
  3. Type command cd folder-location where folder-location can be C:\socketio-over-nodejs
  4. Type npm install express or download ZIP
  5. Type npm install or download ZIP
  6. Type node signaler to run the node.js server

Then open http://localhost:8888/.

If you want to deploy your application

  1. Create an account at nodejitsu
  2. Use same Node.js command prompt window
  3. Type jitsu deploy

and you're done!

Remember: jitsu deploy command will deploy the entire directory containing all all files including node_modules (i.e. dependencies).

How to use?

In ui.js files you can find openSocket method; or in all libraries; you can find openSignalingChannel method.


connection.openSignalingChannel = function(config) {   
   var channel = || || 'default-namespace';
   var sender = Math.round(Math.random() * 9999999999) + 9999999999;

   io.connect(SIGNALING_SERVER).emit('new-channel', {
      channel: channel,
      sender : sender

   var socket = io.connect(SIGNALING_SERVER + channel); = channel;

   socket.on('connect', function () {
      if (config.callback) config.callback(socket);

   socket.send = function (message) {
        socket.emit('message', {
            sender: sender,
            data  : message

   socket.on('message', config.onmessage);

io.connect(URL).emit('new-channel') starts a new namespace that is used privately or publicly to transmit/exchange appropriate stuff e.g. room-details, participation-requests, SDP, ICE, etc.


var config = {
    openSocket: function (config) {

        var SIGNALING_SERVER = ''; = || location.href.replace(/\/|:|#|%|\.|\[|\]/g, '');
        var sender = Math.round(Math.random() * 999999999) + 999999999;

        io.connect(SIGNALING_SERVER).emit('new-channel', {
            sender: sender

        var socket = io.connect(SIGNALING_SERVER +; =;
        socket.on('connect', function () {
            if (config.callback) config.callback(socket);

        socket.send = function (message) {
            socket.emit('message', {
                sender: sender,
                data: message

        socket.on('message', config.onmessage);

Presence Detection

You can detect presence of a room like this:


function testChannelPresence(channel) {
    var socket = io.connect(SIGNALING_SERVER);
    socket.on('presence', function (isChannelPresent) {
        console.log('is channel present', isChannelPresent);
        if (!isChannelPresent) startNewSession();
    socket.emit('presence', channel);

// test whether default channel already created or not!

What is cd folder-location?

Using this command; you can open project's directory (i.e. folder).

What is node signaler?

This command runs node.js server via signaler.js file. That file handles relevant stuff.

What is jitsu deploy?

This command deploys the entire directory (i.e. project, including all node_modules dependencies) over nodejitsu servers. You will be able to access your deployed project using URL like this:

See the demo URL:


Each experiment is using something like this:


This is the URL of your site. By default it will be equal to http://localhost:8888/.

It is strongly recommended to use absolute URL including port number:


Are you beginner or totally novice?

  1. To run on your computer; you need to download node.js software from
  2. If you're using windows; in the Start Menus; you can type node in the search-box. Node.js command prompt will be listed on the top.
  3. You can use same command prompt to run any node.js file; also you can write nodejitsu commands in the same place e.g. jitsu deploy or jitsu login etc.
  4. Default port 8888 is used for this experiment. You can manually open this URL: http://localhost:8888/

Signaling Concepts

Interested to understand WebRTC Signaling Concepts? Read this document.


License over Node.js is released under MIT licence . Copyright (c) Muaz Khan.

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