gluon jwt

jwt.js

// if this is your Base64 encoded string
var str = 'VGhpcyBpcyBhbiBhd2Vzb21lIHNjcmlwdA=='; 

// make URL friendly:
str = str.replace(/\+/g, '-').replace(/\//g, '_').replace(/\=+$/, '');

// reverse to original encoding
str = (str + '===').slice(0, str.length + (str.length % 4));
str = str.replace(/-/g, '+').replace(/_/g, '/');


let b64 = function (utf8) {
  var $this = this;
  var $utf8 = utf8 || this.utf8;
  var map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

  return {
    encode: function (input) {
      if (typeof $utf8 === 'undefined') throw { error: "MissingMethod", message: "UTF8 Module is missing." };
      if (typeof input !== 'string') return input;
      else input = $utf8.encode(input);
      var output = "", a, b, c, d, e, f, g, i = 0;

      while (i < input.length) {
        a = input.charCodeAt(i++);
        b = input.charCodeAt(i++);
        c = input.charCodeAt(i++);
        d = a >> 2;
        e = ((a & 3) << 4) | (b >> 4);
        f = ((b & 15) << 2) | (c >> 6);
        g = c & 63;

        if (isNaN(b)) f = g = 64;
        else if (isNaN(c)) g = 64;

        output += map.charAt(d) + map.charAt(e) + map.charAt(f) + map.charAt(g);
      }

      return output;
    },

    decode: function (input) {
      if (typeof $utf8 === 'undefined') throw { error: "MissingMethod", message: "UTF8 Module is missing." };
      if (typeof input !== 'string') return input;
      else input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
      var output = "", a, b, c, d, e, f, g, i = 0;

      while (i < input.length) {
        d = map.indexOf(input.charAt(i++));
        e = map.indexOf(input.charAt(i++));
        f = map.indexOf(input.charAt(i++));
        g = map.indexOf(input.charAt(i++));

        a = (d << 2) | (e >> 4);
        b = ((e & 15) << 4) | (f >> 2);
        c = ((f & 3) << 6) | g;

        output += String.fromCharCode(a);
        if (f != 64) output += String.fromCharCode(b);
        if (g != 64) output += String.fromCharCode(c);
      }

      return $utf8.decode(output);
    }
  }
}