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+# file-extension
+[![](https://img.shields.io/npm/v/file-extension.svg?style=flat)](https://www.npmjs.org/package/file-extension) [![](https://img.shields.io/npm/dm/file-extension.svg)](https://www.npmjs.org/package/file-extension) [![](https://api.travis-ci.org/silverwind/file-extension.svg?style=flat)](https://travis-ci.org/silverwind/file-extension)
+> Get the extension of a given filename or path
+
+Differences to [`path.extname`](https://nodejs.org/api/path.html#path_path_extname_path):
+
+* Treats dotfiles as extension (`.eslintrc` => `eslintrc`)
+* Treats extensionless files as extension (`Makefile` => `makefile`)
+* Doesn't include the dot in the extension (`package.json` => `json`)
+* Returns lowercase by default (`LICENCE` => `licence`)
+
+Works in Node.js and the browser. The module's size is currently 267 bytes gzipped.
+
+## Installation
+#### Node.js
+```
+$ npm install --save file-extension
+```
+#### Browser
+```html
+<script src="file-extension.js"></script>
+<!-- Available as global `fileExtension` -->
+```
+## Example
+```js
+var fileExtension = require('file-extension'); // Skip this in the browser
+
+// Case insensitive
+fileExtension('file.zip'); //=> 'zip'
+fileExtension('.Dockerfile'); //=> 'dockerfile'
+fileExtension('file'); //=> 'file'
+fileExtension('.file.tar'); //=> 'tar'
+
+// Or with case preserved
+fileExtension('.Vagrantfile', {preserveCase: true}); //=> 'Vagrantfile'
+fileExtension('INDEX.HTML', {preserveCase: true}); //=> 'HTML'
+```
+
+## API
+### fileExtension(filename, [options])
+- `filename` {String} The file name. Required.
+- `options` {Object} Options object.
+
+#### Options
+- `preserveCase` {Boolean} Whether case should be preserved. Default: false.
+
+© [silverwind](https://github.com/silverwind), distributed under BSD licence