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Uses Buffer to emulate the exact functionality of the browser's atob.

Note: Unicode may be handled incorrectly (like the browser).

It turns base64-encoded ascii data back to binary.

(function () {
  "use strict";
  var atob = require('atob');
  var b64 = "SGVsbG8gV29ybGQ=";
  var bin = atob(b64);
  console.log(bin); // "Hello World" 

Need Unicode and Binary Support in the Browser?

Check out unibabel.js


  • v2.0.0 provide browser version for ios web workers
  • v1.2.0 provide (empty) browser version
  • v1.1.3 add MIT license (see #4)
  • v1.1.2 node only


Code copyright 2012-2015 AJ ONeal

Dual-licensed MIT and Apache-2.0

Docs copyright 2012-2015 AJ ONeal

Docs released under Creative Commons.