CBOR Inspector

CBOR Inspector decodes CBOR (Concise Binary Object Representation, RFC 8949) bytes into human-readable diagnostic notation, and encodes diagnostic notation back into bytes. It also supports CBOR sequences (RFC 8742), COSE (RFC 9052) and CWT (RFC 8392) label lookups, and C509 certificates.

All decoding and encoding happens locally in your browser via WebAssembly — nothing you paste or upload is sent to a server. This app requires JavaScript to run; please enable it to use the interactive inspector.

Frequently asked questions

What is CBOR?

A compact binary data format defined in RFC 8949, designed for small code and message size.

What is CBOR diagnostic notation?

CBOR's human-readable text form (RFC 8949 §8), e.g. h'01020304' or {1: "a"}.

Is this open source?

Yes — source on GitHub: github.com/bkioshn/cbor.