asn1js
asn1js is a pure JavaScript library implementing this standard. ASN.1 is the basis of all X.509 related data structures and numerous other protocols used on the web
bitset
A performance optimized infinite bit vector library
@estos/asn1ts
ASN1.ts is a cross platform ASN1 library written in typescript. It supports encoding and (schema supported) decoding of ber encoded asn1 structures.