How does socket.io work

To install it, type the command:. While installing dependences by using nmp with —save-dev flag we are also adding them to the package. Since we have installed Express and Socket. IO, we are ready to write the server part of the application. Below you can find the JavaScript code with comments that explain individual parts of the code.

When both parts server and client are ready, we can launch the Node. JS server. To do this type the command:. Now go to this page and open it in two different bookmarks. While typing the message in one of them and sending it to the server, the text should display in both bookmarks. This is how you create the chat that works in real-time by using just 22 lines of JavaScript code.

That's the magic of WebSockets and this is just the beginning — the possibilities are endless. Be sure to check out our game , which is the perfect example of the WebSocket's possibilities! It solves a lot of problems that web application developers have struggled with before. WebSockets in combination with external libraries such as Socket.

Websocket protocol which is located at layer 7 of the OSI model enables interaction between a web browser or other client applications and a web server with lower overhead than half-duplex alternatives such as http polling hence promoting real-time data transfer between the two.

The project contained two parts before version 1. With the major release, transport handling has been moved to Engine. Apart from that, socket. Setting up socket. The code snippet below shows how to attach socket. For a socket. Here is a code example. The handshake, if successful, results in the client receiving: A session id that will be given for the transport to open connections.

A number of seconds within which a heartbeat is expected heartbeat timeout A number of seconds after the transport connection is closed when the socket is considered disconnected if the transport connection is not reopened close timeout.

HTTP handshake? Fiddler supports websockets now, as does Chrome's developer tools:. Ahmad Baktash Hayeri 5, 3 3 gold badges 29 29 silver badges 41 41 bronze badges. The Overflow Blog.

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Stack Overflow works best with JavaScript enabled. Accept all cookies Customize settings. Version: 4. What Socket. IO is Socket. It consists of: a Node. IO is not meant to be used in a background service, for mobile applications. IO is How does that work?