, often termed as Socket.IO, is a JavaScript library for real-time web applications. It is essential to provide timely feedback to users in a web application and is best suited for these type of applications.

It is an event based bi-directional communication layer for real-time web applications, built atop Engine.IO. It has two parts: a client side library that runs in the browser, and a server side library for node.js. It abstracts various transports, comprising AJAX long-polling as well as WebSockets, into a single application programming interface (API).

Furthermore, it allows developers to send and receive data without worrying about cross-browser compatibility.


  • It simplifies the usage of WebSockets.
  • It provides fail-overs when WebSockets are not supported on the browser or server.
  • It handles the connections transparently.
  • It features multiple server implementations with no native dependencies.

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