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# socket.io-client
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[](http://travis-ci.org/socketio/socket.io-client)
[](https://david-dm.org/socketio/socket.io-client)
[](https://david-dm.org/socketio/socket.io-client#info =devDependencies)
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[](https://www.npmjs.com/package/socket.io-client)
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[](http://slack.socket.io)
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[](https://saucelabs.com/u/socket)
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## How to use
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A standalone build of `socket.io-client` is exposed automatically by the
socket.io server as `/socket.io/socket.io.js` . Alternatively you can
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serve the file `socket.io.js` found in the `dist` folder or include it via [CDN ](https://cdn.jsdelivr.net/npm/socket.io-client@2/dist/socket.io.js ).
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```html
< script src = "/socket.io/socket.io.js" > < / script >
< script >
var socket = io('http://localhost');
socket.on('connect', function(){});
socket.on('event', function(data){});
socket.on('disconnect', function(){});
< / script >
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```
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```js
// with ES6 import
import io from 'socket.io-client';
const socket = io('http://localhost');
```
A slim build (without `JSON3` , a JSON polyfill for IE6/IE7, and `debug` ) is also available: `socket.io.slim.js` .
Socket.IO is compatible with [browserify ](http://browserify.org/ ) and [webpack ](https://webpack.js.org/ ) (see example [there ](https://github.com/socketio/socket.io/tree/2.0.3/examples/webpack-build )).
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### Node.JS (server-side usage)
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Add `socket.io-client` to your `package.json` and then:
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```js
var socket = require('socket.io-client')('http://localhost');
socket.on('connect', function(){});
socket.on('event', function(data){});
socket.on('disconnect', function(){});
```
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## API
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See [API ](/docs/API.md )
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## License
[MIT ](/LICENSE )