In the previous chapter, we used Express and Jade to write the delivery of the assets (HTML, CSS, and JavaScript) of the application. Here, we will stick to pure JavaScript code and will avoid the usage of additional dependencies. The only thing that we need to add to our package.json file is Socket.IO:

{
  "name": "projectname",
  "description": "description",
  "version": "0.0.1",
  "dependencies": {
    "socket.io": "latest"
  }
}

After we call npm install in our project's folder, Socket.IO is placed in a newly created node_modules directory. Let's create two new directories. The following screenshot shows what the application file structure should look like:

The file structure

The application will read the styles.css file and deliver its content to the browser. The same thing will happen with /html/page.html, which is the file that contains the HTML markup of the project. The Node.js code goes to /index.js.