CBOR Inspector
Decode CBOR binary (RFC 7049) into readable structures — inspect IoT and WebAuthn payloads. Read COSE keys without a parser library — local decoding, free, no signup.
How to Use the CBOR Inspector
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Frequently Asked Questions
Where is CBOR used?
WebAuthn attestation, COSE signatures, and constrained IoT — anywhere JSON is too verbose. Inspect here when standards tooling feels heavy.
Tags handled?
Common semantic tags (dates, big numbers) decode to readable forms; unknown tags show raw with tag numbers for manual lookup.
CBOR vs MessagePack?
CBOR standardizes extensibility via tags (IETF); MessagePack optimizes simplicity. Decode either here; convert between them via JSON.
Is my payload uploaded?
No — decoding runs locally in your browser. Payloads never leave your device.
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Last updated October 2026