atob
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')
, b64 = "SGVsbG8gV29ybGQ="
, bin = atob(b64)
;
console.log(bin); // "Hello World"
}());