JSON compression

JSON-compression.js

var lzma = require('lzma');
var data = {
    'address': 'XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX',
    'amount': 100,
    'message': 'This is the long description that will be shown to the user once the user opens the requested transaction.\nThis is the long description that will be shown to the user once the user opens the requested transaction.\nThis is the long description that will be shown to the user once the user opens the requested transaction.\nThis is the long description that will be shown to the user once the user opens the requested transaction.',
    'data': 'Data in the extended transaction',
    'flags': 15
};

var Base64 = {
    _keyStr: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789;:=',
    encode: function(e) {
        var t = '';
        var n, r, i, s, o, u, a;
        var f = 0;
        while (f < e.length) {
            n = e[f++] & 0xFF;
            r = e[f++] & 0xFF;
            i = e[f++] & 0xFF;
            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, ''); // should remove those characters not included in _keyStr
        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.push(n);
            if (u != 64) {
                t.push(r)
            }
            if (a != 64) {
                t.push(i)
            }
        }
        return t
    }  
}

var string = JSON.stringify(data);
console.log(string);
console.log(string.length);

array = lzma.compress(string);
console.log(array.length);

var pack = Base64.encode(array);
console.log(pack);
console.log(pack.length);

var resultArray = Base64.decode(pack);

console.log(resultArray.length);

var result = lzma.decompress(resultArray);

console.log(result);