utf-zap
UTFzap ⚡ ~6.8 kB Intelligent UTF-16 almost 75% faster and 9% lighter compared to the native UTF-8 browser serializer!
uraniumjs
UraniumJS (~40kB) ☢️ - LZ** Compress (-66%) ^ B92 Encode (-25% of B64)
lzbase62
LZ77(LZSS) based compression algorithm in base62 for JavaScript
compatto
Tiny and fast string compression library with Unicode support