Socket.IO enables real-time bidirectional event-based communication. It works on every platform, browser or device, focusing equally on repabipty and speed. Socket.IO is built on top of the WebSockets API (Cpent side) and Node.js. It is one of the most depended upon pbrary on npm (Node Package Manager).

Audience

This tutorial has been created for anyone who has a basic knowledge of HTML, Javascript and Node.js work. After completing this tutorial, the reader will be able to build moderately complex real-time websites, back-ends for mobile apppcations and push notification systems.

Prerequisites

The reader should have a basic knowledge of HTML, JavaScript and Node.js. If the readers are not acquainted with these, we will suggest them to go through these tutorials first. We will be using Express to ease creating servers; it is not a prerequisite though.