CBOR Encoder / Decoder

CBOR Encoder / Decoder

Encode JSON to CBOR and decode CBOR back to JSON — fully client-side. CBOR (Concise Binary Object Representation) is a compact binary data format defined in RFC 8949, widely used in IoT, WebAuthn, and COSE protocols.

How to Use

Switch between Decode and Encode modes. To decode, paste CBOR data as hex or base64 and see the JSON output, diagnostic notation, and a detailed byte breakdown. To encode, paste JSON and get CBOR output in hex or base64 format.

Features

• Decode CBOR to JSON – Paste hex or base64-encoded CBOR and view the structured JSON output
• Encode JSON to CBOR – Convert JSON data into CBOR hex or base64 format
• Diagnostic notation – Human-readable CBOR representation for debugging
• Byte breakdown – Inspect major types, additional info, and raw bytes
• Full RFC 8949 support – Integers, floats, strings, arrays, maps, tags, and simple values
• Indefinite-length items – Supports streaming arrays and maps
• Multiple output formats – Copy as hex, base64, or diagnostic notation