Haha thanks for the information, I don't know very mucht about UTF8 / UTF-16

Socket.io don't support binary yet :(
If you think its easy to create a compressToUTF8() than I say :)

I quick compression check gives me this

msg = {data:'I say hello'}
console.log('no compression',JSON.stringify(msg).length)
compr = LZString.LZString.compressToUTF16(JSON.stringify(msg));
console.log('compression',compr.length);

no compression 22
compression 17
 

msg = {data:'I say hello, I can say more and more text so this is big'}
console.log('no compression',JSON.stringify(msg).length)
compr = LZString.LZString.compressToUTF16(JSON.stringify(msg));
console.log('compression',compr.length);