nodejs btoa

1Buffer.from('Hello world!', 'binary').toString('base64')

1(function () {
2  "use strict";
3
4  var atob = require('atob');
5  var b64 = "SGVsbG8sIFdvcmxkIQ==";
6  var bin = atob(b64);
7
8  console.log(bin); // "Hello, World!"
9}());
10

1console.log(Buffer.from('Hello World!').toString('base64'));
2