LZ compression for JavaScript compresses and decompresses JavaScript strings.

• Easy to use.
• Fast LZipperLite.js is faster than any LZW JavaScript compression I have tested so far.

First release for ECMAScript6 Added LZipperLite that is compatible with ECMAScript5 Removed older versions now only using LZipperLite

Simply add LZipperLite.js

<script src="LZipperLite.js"></script>

LZipperLite.js adds the global object LZipper to the global name-space providing four functions

String = LZipper.compress(String);
String = LZipper.decompress(String)
String = LZipper.char2Int(String)
String = LZipper.int2Char(String)

Methods.

LZipper.compress Arguments data a String to be compressed. returns a string representing a compressed version of the input string

LZipper.decompress Arguments compressed a compressed string. returns an uncompressed string.

LZipper.int2Char Arguments String a javascript 16 bit unicode string returns String 8 bit encoded unicode string. Uses only the first 8bits to encode all the unicode characters so that the string can be converted to Base64 via window.btoa

LZipper.int2Char Arguments String a javascript 8 bit encoded 16bit unicode string. See above returns String The 16 bit unicode string

LZipper is handy for storing data in localStorage

Save to local storage.

// myObject represents a javascript object.
localStorage.myData = LZipper.compress ( JSON.stringify (myObject) ); // save compress JSON to local storage

Retrieval.

var myObject;
if (localStorage.myData !== undefined) {
    myObject = JSON.parse ( LZipper.decompress ( localStorage.myData ));
}

I have added two functions to allow the compressed string to be converted to Base64 so it can be added to a URL, this is to deal with the URL size limitations that browsers have.

To compress and add to a URL

var data = JSON.stringify(myData);
var href = "https://myweb.com/page.html?data=" + btoa(LZipper.int2Char(LZipper.compress(data)))

To decompress from url

var data = location.href.split("?data=")[0];
var myData = JSON.parse(LZipper.decompress(LZipper.char2Int(atob(data))));

Knowledge of JavaScript