@thi.ng/base-n
Arbitrary base-n conversions w/ presets for base8/16/32/36/58/62/64/83/85, support for bigints and encoding/decoding of byte arrays
base-ex
A collection of classes for data representation written in JavaScript.
dencodeme
Encode/Decode data using various encoding schemes.
allbases
Transform values of abritrary size to an arbritrary base
universal-encoder
Convert any number or ASCII text to any base, using RFC4648 character set or your own custom character sets.