CBOR Decoder
Walk a CBOR (RFC 8949) blob into a structural tree. Accepts hex or base64url. Built for WebAuthn attestation objects, COSE keys, and CTAP2 messages — but works for any CBOR.
Input
Decoded
Paste CBOR bytes to decode.
All decoding runs locally.
About CBOR
CBOR (Concise Binary Object Representation) is the wire format used by FIDO CTAP2, COSE (RFC 8152), the WebAuthn attestation object, and many constrained-device protocols. The major-type encoding makes parsers compact and fast even on small MCUs.
Spec
RFC 8949 (CBOR data model and encoding).