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Base64 encoding/decoding in pure JS
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feross add tidelift link
@beatgammit Tidelift asked me to support this package. I tried emailing you with no response. Lmk if you want to claim the Tidelift funds from this (~$50/mo) and it's yours :)
Latest commit b40564b Oct 1, 2019


base64-js does basic base64 encoding/decoding in pure JS.

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Many browsers already have base64 encoding/decoding functionality, but it is for text data, not all-purpose binary data.

Sometimes encoding/decoding binary data in the browser is useful, and that is what this module does.


With npm do:

npm install base64-js and var base64js = require('base64-js')

For use in web browsers do:

<script src="base64js.min.js"></script>

Get supported base64-js with the Tidelift Subscription


base64js has three exposed functions, byteLength, toByteArray and fromByteArray, which both take a single argument.

  • byteLength - Takes a base64 string and returns length of byte array
  • toByteArray - Takes a base64 string and returns a byte array
  • fromByteArray - Takes a byte array and returns a base64 string



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