I maintain several Node.js modules. Here’s a list of the most noteworthy ones, in alphabetical order:
base-convert-int-arrayconverts arrays of integers from one base to another. Uses an O(N²) algorithm.
common-path-prefixcomputes the longest prefix string that is common to each path, excluding the base component.
identifierfyrewrites an identifier string so its valid according to ES2015.
release-zalgohelps you write code with promise-like chains that can run both synchronously and asynchronously.
sixtyfourcontains Base64 utilities.
unicode-diffprovides the differences between Unicode versions. Useful when dealing with programs that don’t handle newer code points.
x690is a low-level decoder for X.690 Distinguished Encoding Rules (DER).