CODE EXAMPLE FOR JAVASCRIPT

nodejs buffer.from base64

//--------------- HOW TO DECODE BASE64 ON NODEJS ----------------------
//create a buffer of the text "Hello World"
var buffer = Buffer.from('SGVsbG8gV29ybGQ=', 'base64');
//buffer result is: <Buffer 48 65 6c 6c 6f 20 57 6f 72 6c 64>

var string64 = buffer.toString('ascii');
// .toString('ascii') allow to decode base64
// result is: "Hello World"

// Can be use combined together like these
console.log(Buffer.from('SGVsbG8gV29ybGQ=', 'base64').toString('ascii'));
// result is: "Hello World"