Installing Socket.io

Before you can use the Socket.io module, you will need to install it using npm. To do so, change your package.json file as follows:

{
  "name": "MEAN",
  "version": "0.0.9",
  "dependencies": {
    "express": "~4.8.8",
    "morgan": "~1.3.0",
    "compression": "~1.0.11",
    "body-parser": "~1.8.0",
    "method-override": "~2.2.0",
    "express-session": "~1.7.6",
    "ejs": "~1.0.0",
    "connect-flash": "~0.1.1",
    "mongoose": "~3.8.15",
    "passport": "~0.2.1",
    "passport-local": "~1.0.0",
    "passport-facebook": "~1.0.3",
    "passport-twitter": "~1.0.2",
    "passport-google-oauth": "~0.1.5",
    "socket.io": "~1.1.0"
  }
}

To install the Socket.io module, go to your application's root folder and issue the following command in your command-line tool:

$ npm install

As usual, this will install the specified version of Socket.io in your node_modules folder. When the installation process is successfully over, your will need be to configure your Express application...