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# wtf-8 [![Build status](https://travis-ci.org/mathiasbynens/wtf-8.svg?branch=master)](https://travis-ci.org/mathiasbynens/wtf-8) [![Dependency status](https://gemnasium.com/mathiasbynens/wtf-8.svg)](https://gemnasium.com/mathiasbynens/wtf-8)
_wtf-8_ is a well-tested [WTF-8](https://simonsapin.github.io/wtf-8/) encoder/decoder written in JavaScript. WTF-8 is a superset of UTF-8: it can encode/decode any given Unicode code point, including those of (unpaired) surrogates. [Here’s an online demo.](https://mothereff.in/wtf-8)
Feel free to fork if you see possible improvements!
## Installation
Via [npm](http://npmjs.org/):
```bash npm install wtf-8 ```
Via [Bower](http://bower.io/):
```bash bower install wtf-8 ```
Via [Component](https://github.com/component/component):
```bash component install mathiasbynens/wtf-8 ```
In a browser:
```html <script src="wtf-8.js"></script> ```
In [Narwhal](http://narwhaljs.org/), [Node.js](http://nodejs.org/), and [RingoJS ≥ v0.8.0](http://ringojs.org/):
```js var wtf8 = require('wtf-8'); ```
In [Rhino](http://www.mozilla.org/rhino/):
```js load('wtf-8.js'); ```
Using an AMD loader like [RequireJS](http://requirejs.org/):
```js require( { 'paths': { 'wtf-8': 'path/to/wtf-8' } }, ['wtf-8'], function(wtf8) { console.log(wtf8); } ); ```
## API
### `wtf8.encode(string)`
Encodes any given JavaScript string (`string`) as WTF-8, and returns the WTF-8-encoded version of the string.
```js // U+00A9 COPYRIGHT SIGN; see http://codepoints.net/U+00A9 wtf8.encode('\xA9'); // → '\xC2\xA9' // U+10001 LINEAR B SYLLABLE B038 E; see http://codepoints.net/U+10001 wtf8.encode('\uD800\uDC01'); // → '\xF0\x90\x80\x81' ```
### `wtf8.decode(byteString)`
Decodes any given WTF-8-encoded string (`byteString`) as WTF-8, and returns the WTF-8-decoded version of the string. It throws an error when malformed WTF-8 is detected.
```js wtf8.decode('\xC2\xA9'); // → '\xA9'
wtf8.decode('\xF0\x90\x80\x81'); // → '\uD800\uDC01' // → U+10001 LINEAR B SYLLABLE B038 E ```
### `wtf8.version`
A string representing the semantic version number.
## Support
_wtf-8_ has been tested in (at least) the latest versions of Chrome, Opera, Firefox, Safari, IE, Node.js, Narwhal, RingoJS, PhantomJS, and Rhino.
## Author
| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") | |---| | [Mathias Bynens](https://mathiasbynens.be/) |
## License
_wtf-8_ is available under the [MIT](https://mths.be/mit) license.
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