var crypto = require('crypto');

//md5
crypto.createHash('md5').update(data).digest("hex");

//urlencode
encodeURIComponent('?x=шеллы')

//base64
*encode
  Buffer.from("Hello World").toString('base64')
*decode
  Buffer.from("SGVsbG8gV29ybGQ=", 'base64').toString('ascii')