@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
sys-conv-util
Uma função utilitária para conversões entre sistemas numéricos (Base10, Base2, Base64) e texto em JavaScript.
base-ex
A collection of classes for data representation written in JavaScript.