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Encoding and Decoding Base64 Strings in Node.js

'use strict';

let data = 'stackabuse.com';
let buff = new Buffer(data);
let base64data = buff.toString('base64');

console.log('"' + data + '" converted to Base64 is "' + base64data + '"');

Decodes a string of data which has been encoded using base-64 encoding - Nodejs

const atob = str => Buffer.from(str, 'base64').toString('binary'); atob('Zm9vYmFy'); // 'foobar'