base64url.encode('Node.js is awesome.')
// returns Tm9kZS5qcyBpcyBhd2Vzb21lLg

base64url.decode('Tm9kZS5qcyBpcyBhd2Vzb21lLg')
// returns Node.js is awesome.

base64url.escape('This+is/goingto+escape==')
// returns This-is_goingto-escape

base64url.unescape('This-is_goingto-escape')
// returns This+is/goingto+escape==

//
// setting a different encoding 
//

base64url.encode(string to encode, encoding)
base64url.decode(string to decode, encoding)