btoa for Node.JS (it's a one-liner)

npm install btoa
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Uses Buffer to emulate the exact functionality of the browser's btoa (except that it supports unicode and the browser may not).

It turns binary data to base64-encoded ascii.

(function () {
  "use strict";

  var btoa = require('btoa')
    , bin = "Hello, 世界"
    , b64 = btoa(bin)

  console.log(b64); // "SGVsbG8sIBZM"

Note: Unicode may or may not be handled incorrectly.

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