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# socket.io


    		
  

  

    
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[![Backers on Open Collective](https://opencollective.com/socketio/backers/badge.svg)](#backers) [![Sponsors on Open Collective](https://opencollective.com/socketio/sponsors/badge.svg)](#sponsors)


    		
  

  

    
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[![Build Status](https://secure.travis-ci.org/socketio/socket.io.svg?branch=master)](https://travis-ci.org/socketio/socket.io)


    		
  

  

    
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[![Dependency Status](https://david-dm.org/socketio/socket.io.svg)](https://david-dm.org/socketio/socket.io)


    		
  

  

    
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[![devDependency Status](https://david-dm.org/socketio/socket.io/dev-status.svg)](https://david-dm.org/socketio/socket.io#info=devDependencies)


    		
  

  

    
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[![NPM version](https://badge.fury.io/js/socket.io.svg)](https://www.npmjs.com/package/socket.io)


    		
  

  

    
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![Downloads](https://img.shields.io/npm/dm/socket.io.svg?style=flat)


    		
  

  

    
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[![](https://slackin-socketio.now.sh/badge.svg)](https://slackin-socketio.now.sh)


    		
  

  

    
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## Features


    		
  

  

    
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Socket.IO enables real-time bidirectional event-based communication. It consists in:


    		
  

  

    
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- a Node.js server (this repository)


    		
  

  

    
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- a [Javascript client library](https://github.com/socketio/socket.io-client) for the browser (or a Node.js client)


    		
  

  

    
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Some implementations in other languages are also available:


    		
  

  

    
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- [Java](https://github.com/socketio/socket.io-client-java)


    		
  

  

    
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- [C++](https://github.com/socketio/socket.io-client-cpp)


    		
  

  

    
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- [Swift](https://github.com/socketio/socket.io-client-swift)


    		
  

  

    
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Its main features are:


    		
  

  

    
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#### Reliability


    		
  

  

    
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Connections are established even in the presence of:


    		
  

  

    
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  - proxies and load balancers.


    		
  

  

    
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  - personal firewall and antivirus software.


    		
  

  

    
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For this purpose, it relies on [Engine.IO](https://github.com/socketio/engine.io), which first establishes a long-polling connection, then tries to upgrade to better transports that are "tested" on the side, like WebSocket. Please see the [Goals](https://github.com/socketio/engine.io#goals) section for more information.


    		
  

  

    
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#### Auto-reconnection support


    		
  

  

    
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Unless instructed otherwise a disconnected client will try to reconnect forever, until the server is available again. Please see the available reconnection options [here](https://github.com/socketio/socket.io-client/blob/master/docs/API.md#new-managerurl-options).


    		
  

  

    
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#### Disconnection detection


    		
  

  

    
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An heartbeat mechanism is implemented at the Engine.IO level, allowing both the server and the client to know when the other one is not responding anymore.


    		
  

  

    
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That functionality is achieved with timers set on both the server and the client, with timeout values (the `pingInterval` and `pingTimeout` parameters) shared during the connection handshake. Those timers require any subsequent client calls to be directed to the same server, hence the `sticky-session` requirement when using multiples nodes.


    		
  

  

    
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#### Binary support


    		
  

  

    
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Any serializable data structures can be emitted, including:


    		
  

  

    
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- [ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) and [Blob](https://developer.mozilla.org/en-US/docs/Web/API/Blob) in the browser


    		
  

  

    
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- [ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) and [Buffer](https://nodejs.org/api/buffer.html) in Node.js


    		
  

  

    
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#### Simple and convenient API


    		
  

  

    
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Sample code:


    		
  

  

    
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```js


    		
  

  

    
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io.on('connection', function(socket){


    		
  

  

    
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  socket.emit('request', /* */); // emit an event to the socket


    		
  

  

    
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  io.emit('broadcast', /* */); // emit an event to all connected sockets


    		
  

  

    
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  socket.on('reply', function(){ /* */ }); // listen to the event


    		
  

  

    
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});


    		
  

  

    
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```


    		
  

  

    
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#### Cross-browser


    		
  

  

    
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Browser support is tested in Saucelabs:


    		
  

  

    
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[![Sauce Test Status](https://saucelabs.com/browser-matrix/socket.svg)](https://saucelabs.com/u/socket)


    		
  

  

    
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#### Multiplexing support


    		
  

  

    
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In order to create separation of concerns within your application (for example per module, or based on permissions), Socket.IO allows you to create several `Namespaces`, which will act as separate communication channels but will share the same underlying connection.


    		
  

  

    
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#### Room support


    		
  

  

    
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Within each `Namespace`, you can define arbitrary channels, called `Rooms`, that sockets can join and leave. You can then broadcast to any given room, reaching every socket that has joined it.


    		
  

  

    
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This is a useful feature to send notifications to a group of users, or to a given user connected on several devices for example.


    		
  

  

    
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**Note:** Socket.IO is not a WebSocket implementation. Although Socket.IO indeed uses WebSocket as a transport when possible, it adds some metadata to each packet: the packet type, the namespace and the ack id when a message acknowledgement is needed. That is why a WebSocket client will not be able to successfully connect to a Socket.IO server, and a Socket.IO client will not be able to connect to a WebSocket server (like `ws://echo.websocket.org`) either. Please see the protocol specification [here](https://github.com/socketio/socket.io-protocol).


    		
  

  

    
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## Installation


    		
  

  

    
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```bash


    		
  

  

    
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npm install socket.io --save


    		
  

  

    
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```


    		
  

  

    
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## How to use


    		
  

  

    
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The following example attaches socket.io to a plain Node.JS


    		
  

  

    
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HTTP server listening on port `3000`.


    		
  

  

    
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```js


    		
  

  

    
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var server = require('http').createServer();


    		
  

  

    
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var io = require('socket.io')(server);


    		
  

  

    
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io.on('connection', function(client){


    		
  

  

    
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  client.on('event', function(data){});


    		
  

  

    
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  client.on('disconnect', function(){});


    		
  

  

    
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});


    		
  

  

    
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server.listen(3000);


    		
  

  

    
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```


    		
  

  

    
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### Standalone


    		
  

  

    
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```js


    		
  

  

    
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var io = require('socket.io')();


    		
  

  

    
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io.on('connection', function(client){});


    		
  

  

    
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io.listen(3000);


    		
  

  

    
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```


    		
  

  

    
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### In conjunction with Express


    		
  

  

    
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Starting with **3.0**, express applications have become request handler


    		
  

  

    
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functions that you pass to `http` or `http` `Server` instances. You need


    		
  

  

    
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to pass the `Server` to `socket.io`, and not the express application


    		
  

  

    
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function. Also make sure to call `.listen` on the `server`, not the `app`.


    		
  

  

    
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```js


    		
  

  

    
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var app = require('express')();


    		
  

  

    
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var server = require('http').createServer(app);


    		
  

  

    
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var io = require('socket.io')(server);


    		
  

  

    
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io.on('connection', function(){ /* … */ });


    		
  

  

    
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server.listen(3000);


    		
  

  

    
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```


    		
  

  

    
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### In conjunction with Koa


    		
  

  

    
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Like Express.JS, Koa works by exposing an application as a request


    		
  

  

    
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handler function, but only by calling the `callback` method.


    		
  

  

    
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```js


    		
  

  

    
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var app = require('koa')();


    		
  

  

    
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var server = require('http').createServer(app.callback());


    		
  

  

    
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var io = require('socket.io')(server);


    		
  

  

    
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io.on('connection', function(){ /* … */ });


    		
  

  

    
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server.listen(3000);


    		
  

  

    
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```


    		
  

  

    
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## Documentation


    		
  

  

    
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Please see the documentation [here](/docs/README.md). Contributions are welcome!


    		
  

  

    
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## Debug / logging


    		
  

  

    
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Socket.IO is powered by [debug](https://github.com/visionmedia/debug).


    		
  

  

    
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In order to see all the debug output, run your app with the environment variable


    		
  

  

    
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`DEBUG` including the desired scope.


    		
  

  

    
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To see the output from all of Socket.IO's debugging scopes you can use:


    		
  

  

    
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```


    		
  

  

    
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DEBUG=socket.io* node myapp


    		
  

  

    
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```


    		
  

  

    
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## Testing


    		
  

  

    
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```


    		
  

  

    
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npm test


    		
  

  

    
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```


    		
  

  

    
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This runs the `gulp` task `test`. By default the test will be run with the source code in `lib` directory.


    		
  

  

    
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Set the environmental variable `TEST_VERSION` to `compat` to test the transpiled es5-compat version of the code.


    		
  

  

    
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The `gulp` task `test` will always transpile the source code into es5 and export to `dist` first before running the test.


    		
  

  

    
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## Backers


    		
  

  

    
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Support us with a monthly donation and help us continue our activities. [[Become a backer](https://opencollective.com/socketio#backer)]


    		
  

  

    
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<a href="https://opencollective.com/socketio/backer/0/website" target="_blank"><img src="https://opencollective.com/socketio/backer/0/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/backer/1/website" target="_blank"><img src="https://opencollective.com/socketio/backer/1/avatar.svg"></a>


    		
  

  

    
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## Sponsors


    		
  

  

    
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Become a sponsor and get your logo on our README on Github with a link to your site. [[Become a sponsor](https://opencollective.com/socketio#sponsor)]


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/0/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/0/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/1/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/1/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/5/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/5/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/6/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/6/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/7/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/7/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/8/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/8/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/9/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/9/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/10/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/10/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/11/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/11/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/12/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/12/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/13/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/13/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/14/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/14/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/15/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/15/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/16/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/16/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/17/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/17/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/18/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/18/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/19/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/19/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/20/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/20/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/21/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/21/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/22/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/22/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/23/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/23/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/24/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/24/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/25/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/25/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/26/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/26/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/27/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/27/avatar.svg"></a>


    		
  

  

    
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<a href="https://opencollective.com/socketio/sponsor/28/website" target="_blank"><img src="https://opencollective.com/socketio/sponsor/28/avatar.svg"></a>


    		
  

  

    
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## License


    		
  

  

    
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[MIT](LICENSE)