4`base64-js` does basic base64 encoding/decoding in pure JS.
6[](http://travis-ci.org/beatgammit/base64-js)
8Many browsers already have base64 encoding/decoding functionality, but it is for text data, not all-purpose binary data.
10Sometimes encoding/decoding binary data in the browser is useful, and that is what this module does.
14With [npm](https://npmjs.org) do:
16`npm install base64-js` and `var base64js = require('base64-js')`
18For use in web browsers do:
20`<script src="base64js.min.js"></script>`
22[Get supported base64-js with the Tidelift Subscription](https://tidelift.com/subscription/pkg/npm-base64-js?utm_source=npm-base64-js&utm_medium=referral&utm_campaign=readme)
26`base64js` has three exposed functions, `byteLength`, `toByteArray` and `fromByteArray`, which both take a single argument.
28* `byteLength` - Takes a base64 string and returns length of byte array
29* `toByteArray` - Takes a base64 string and returns a byte array
30* `fromByteArray` - Takes a byte array and returns a base64 string
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