freeplanet_serverside/server/reg/registration.js

const jwt = require('jsonwebtoken');

function toHexString(bytes) {
  return Array.from(bytes, byte =>
    ("00" + (byte & 0xFF).toString(16)).slice(-2)
  ).join('');
}

module.exports = {
  getlinkregByEmail: function (idapp, email, username) {
    try{
      mystr = idapp + email + username;
    return jwt.sign(toHexString(mystr), process.env.SIGNCODE).toString();
    } catch (e) {
      console.error(e);
    }
  },
};