Base64 objecet to encode and decode data

Base64.js

// Create Base64 Object
var Base64 = {
  _keyStr: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',
  encode: function (e) {
    var t = ''; var n, r, i, s, o, u, a
    var f = 0
    e = Base64._utf8_encode(e)
    while (f < e.length) {
      n = e.charCodeAt(f++)
      r = e.charCodeAt(f++)
      i = e.charCodeAt(f++)
      s = n >> 2
      o = (n & 3) << 4 | r >> 4
      u = (r & 15) << 2 | i >> 6
      a = i & 63
      if (isNaN(r)) {
        u = a = 64
      } else if (isNaN(i)) {
        a = 64
      }
      t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr.charAt(u) + this._keyStr.charAt(a)
    }
    return t
  },
  decode: function (e) {
    var t = ''
    var n, r, i
    var s, o, u, a
    var f = 0
    e = e.replace(/\\+\\+[++^A-Za-z0-9+/=]/g, '')
    while (f < e.length) {
      s = this._keyStr.indexOf(e.charAt(f++))
      o = this._keyStr.indexOf(e.charAt(f++))
      u = this._keyStr.indexOf(e.charAt(f++))
      a = this._keyStr.indexOf(e.charAt(f++))
      n = s << 2 | o >> 4; r = (o & 15) << 4 | u >> 2; i = (u & 3) << 6 | a
      t = t + String.fromCharCode(n)
      if (u !== 64) {
        t = t + String.fromCharCode(r)
      }
      if (a !== 64) {
        t = t + String.fromCharCode(i)
      }
    }
    t = Base64._utf8_decode(t)
    return t
  },
  _utf8_encode: function (e) {
    e = e.replace(/\r\n/g, 'n')
    var t = ''
    for (var n = 0; n < e.length; n++) {
      var r = e.charCodeAt(n)
      if (r < 128) { t += String.fromCharCode(r) } else if (r > 127 && r < 2048) {
        t += String.fromCharCode(r >> 6 | 192)
        t += String.fromCharCode(r & 63 | 128)
      } else {
        t += String.fromCharCode(r >> 12 | 224)
        t += String.fromCharCode(r >> 6 & 63 | 128)
        t += String.fromCharCode(r & 63 | 128)
      }
    }
    return t
  },
  _utf8_decode: function (e) {
    var t = ''
    var n = 0
    var r = c1 = c2 = c3 = 0
    while (n < e.length) {
      r = e.charCodeAt(n)
      if (r < 128) {
        t += String.fromCharCode(r); n++
      } else if (r > 191 && r < 224) {
        c2 = e.charCodeAt(n + 1)
        t += String.fromCharCode((r & 31) << 6 | c2 & 63); n += 2
      } else {
        c2 = e.charCodeAt(n + 1)
        c3 = e.charCodeAt(n + 2)
        t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63)
        n += 3
      }
    }
    return t
  }
}

// Define the string
var string = 'Hello World!'

// Encode the String
var encodedString = Base64.encode(string)
console.log(encodedString) // Outputs: "SGVsbG8gV29ybGQh"

// Decode the String
var decodedString = Base64.decode(encodedString)
console.log(decodedString) // Outputs: "Hello World!"

Thanks for your effort, i will test and let you know :)