ASN.1 Viewer
This ASN.1 viewer (a.k.a poor man's asn1js.eu) demonstrates awesn1's parsing capabilities. It is not intended to compete with asn1js.eu, but rather to showcase that awesn1 indeed works on JS targets as advertised. No server-side logic is involved. All processing happens in a single <700KB JavaScript file. Do not treat the viewer's structural rendering as authoritative output! awesn1 is solid, but the glue code to facilitate HTML rendering is 50 shades of AI slop! The thing it has going for it, is built-in semantics for the Android key attestation extension, which you can try out here.
ASN.1 Structure
DER hex
tag · length · primitive content