Smart/lossless compression algorithm for repeating data structures

Fun and this works in the browser for client side compression because it's fully js. Snappy is written in C and doesn't work in the browser.

Or LZ4. http://code.google.com/p/lz4/ http://fastcompression.blogspot.com/2011/05/lz4-explained.ht...

Atm snappy seems a bit more mature, though.