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Passkey sign-in worked every time on my machine, then the exact same code threw an error the moment I pushed it to the real domain.
What you'll have at the end
A Relying Party configuration read from the deployment's own environment and checked against what the browser itself reports, so the same registration and sign-in code passes on localhost and on the live domain without a hand-edited domain string before each push.
You need
A passkey registration and sign-in flow that already works against a local dev server, backed by a small backend that currently reads its Relying Party ID and expected origin from two hardcoded string constants.
Not covered
Writing a general handler that turns every kind of WebAuthn failure into a user-facing message, or deciding whether to offer a passkey option at all.
Leans on
Checked 22 Aug 2026
Part of the Web Authentication and Passkeys cookbook