How to create base64 string and get it back in NodeJS

base64.js

# Buffer is a default Nodejs global object

const initialString = 'michelepatrassi';
const token = Buffer.from(initialString).toString('base64');

# want to get it back?
const welcomeBack = Buffer.from(token, 'base64').toString('ascii');

if (initialString === welcomeBack) {
  console.log('all good!');
}