Is it possible to test this locally via a rest tool. I've created the backend to generate the challenge etc for Registration of new creds, but without the WebAuthn response I'm at a loss if I have created the correct way to digest the response object from WebAuthn.
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If you're writing a FIDO2 / WebAuthn library, the FIDO Alliance does actually provide with a test suite that should be capable of generating tests: FIDO Alliance - Conformance SelfâValidation Testing (then clic on "registration" in the "FIDO2 Test Tools" section).
Note that the same FIDO Alliance proposes a non-mandatory standard way of exposing FIDO2 through a REST API: Transport Binding Profile

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