FWIW if you don't care about attestation, Webauthn-L2 has client-side helper functions like getPublicKey() that allow you to do the handshake without parsing a

FWIW if you don't care about attestation, Webauthn-L2 has client-side helper functions like getPublicKey() that allow you to do the handshake without parsing any CBOR https://www.w3.org/TR/webauthn-2/#sctn-public-key-easy https://www.w3.org/TR/webauthn-2/#sctn-public-key-easy If you want to check attestation you still need to parse CBOR (and whatever attestation format is inside.) I used this for a minimal webauthn implementation which is under 300 LoC https://github.com/arianvp/webauthn-minimal https://github.com/arianvp/webauthn-minimal (WIP) However only Chrome seems to implement the L2 spec so far. It feels like Webauthn is basically abandoned on Mozilla side of things as they still haven't finished implementing L1 (It's missing all the CTAP2 stuff) whilst it has been out for more than a year. And there have barely been any Webauthn-related commits in the past years. But yeh; in general webauthn is a design-by-committee dumpster fire; unfortunately. U2F was conceptually way simpler.