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# base64 [](https://travis-ci.org/mathiasbynens/base64) [](https://coveralls.io/r/mathiasbynens/base64)
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_base64_ is a robust base64 encoder/decoder that is fully compatible with [`atob()` and `btoa()`](https://html.spec.whatwg.org/multipage/webappapis.html#atob), written in JavaScript. The base64-encoding and -decoding algorithms it uses are fully [RFC 4648](https://tools.ietf.org/html/rfc4648#section-4) compliant.
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## Installation
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Via [npm](https://www.npmjs.com/):
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```bash
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npm install base-64
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```
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In a browser:
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```html
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<script src="base64.js"></script>
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```
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In [Narwhal](http://narwhaljs.org/), [Node.js](https://nodejs.org/), and [RingoJS](http://ringojs.org/):
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```js
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var base64 = require('base-64');
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```
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In [Rhino](http://www.mozilla.org/rhino/):
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```js
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load('base64.js');
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```
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Using an AMD loader like [RequireJS](http://requirejs.org/):
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```js
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require(
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{
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'paths': {
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'base64': 'path/to/base64'
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}
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},
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['base64'],
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function(base64) {
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console.log(base64);
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}
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);
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```
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## API
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### `base64.version`
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A string representing the semantic version number.
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### `base64.encode(input)`
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This function takes a byte string (the `input` parameter) and encodes it according to base64. The input data must be in the form of a string containing only characters in the range from U+0000 to U+00FF, each representing a binary byte with values `0x00` to `0xFF`. The `base64.encode()` function is designed to be fully compatible with [`btoa()` as described in the HTML Standard](https://html.spec.whatwg.org/multipage/webappapis.html#dom-windowbase64-btoa).
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```js
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var encodedData = base64.encode(input);
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```
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To base64-encode any Unicode string, [encode it as UTF-8 first](https://github.com/mathiasbynens/utf8.js#utf8encodestring):
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```js
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var base64 = require('base-64');
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var utf8 = require('utf8');
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var text = 'foo © bar 𝌆 baz';
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var bytes = utf8.encode(text);
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var encoded = base64.encode(bytes);
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console.log(encoded);
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// → 'Zm9vIMKpIGJhciDwnYyGIGJheg=='
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```
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### `base64.decode(input)`
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This function takes a base64-encoded string (the `input` parameter) and decodes it. The return value is in the form of a string containing only characters in the range from U+0000 to U+00FF, each representing a binary byte with values `0x00` to `0xFF`. The `base64.decode()` function is designed to be fully compatible with [`atob()` as described in the HTML Standard](https://html.spec.whatwg.org/multipage/webappapis.html#dom-windowbase64-atob).
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```js
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var decodedData = base64.decode(encodedData);
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```
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To base64-decode UTF-8-encoded data back into a Unicode string, [UTF-8-decode it](https://github.com/mathiasbynens/utf8.js#utf8decodebytestring) after base64-decoding it:
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```js
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var encoded = 'Zm9vIMKpIGJhciDwnYyGIGJheg==';
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var bytes = base64.decode(encoded);
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var text = utf8.decode(bytes);
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console.log(text);
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// → 'foo © bar 𝌆 baz'
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```
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## Support
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_base64_ is designed to work in at least Node.js v0.10.0, Narwhal 0.3.2, RingoJS 0.8-0.9, PhantomJS 1.9.0, Rhino 1.7RC4, as well as old and modern versions of Chrome, Firefox, Safari, Opera, and Internet Explorer.
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## Unit tests & code coverage
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After cloning this repository, run `npm install` to install the dependencies needed for development and testing. You may want to install Istanbul _globally_ using `npm install istanbul -g`.
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Once that’s done, you can run the unit tests in Node using `npm test` or `node tests/tests.js`. To run the tests in Rhino, Ringo, Narwhal, and web browsers as well, use `grunt test`.
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To generate the code coverage report, use `grunt cover`.
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## Author
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| [](https://twitter.com/mathias "Follow @mathias on Twitter") |
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| [Mathias Bynens](https://mathiasbynens.be/) |
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## License
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_base64_ is available under the [MIT](https://mths.be/mit) license.
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