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# socket.io-client
[](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) [](https://www.npmjs.com/package/socket.io-client)  [](http://slack.socket.io)
[](https://saucelabs.com/u/socket)
## How to use
A standalone build of `socket.io-client` is exposed automatically by the socket.io server as `/socket.io/socket.io.js`. Alternatively you can 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).
```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> ```
```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)).
### Node.JS (server-side usage)
Add `socket.io-client` to your `package.json` and then:
```js var socket = require('socket.io-client')('http://localhost'); socket.on('connect', function(){}); socket.on('event', function(data){}); socket.on('disconnect', function(){}); ```
## API
See [API](/docs/API.md)
## License
[MIT](/LICENSE)
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