CBOR ↔ JSON Converter / Viewer
Options
Quick notes
- Decode Base64 CBOR to JSON
- Decode hex CBOR to JSON
- Encode JSON to CBOR and download it as a file
What is CBOR ↔ JSON Converter / Viewer?
This tool converts JSON to CBOR and decodes CBOR back to JSON.
It is useful for WebAuthn, passkeys, IoT, compact binary APIs, debugging binary payloads, and interoperability testing.
How to use CBOR ↔ JSON Converter / Viewer
- Paste JSON and click Encode to convert it into CBOR.
- Paste Base64 or hex CBOR and click Decode to convert it into JSON.
- Use Auto-detect if you are not sure whether the input is JSON, Base64, or hex.
- Upload or download .cbor files when needed.
Tips
- CBOR is a binary format, so Base64 and hex are the most convenient text representations.
- This tool is especially useful when debugging WebAuthn and passkey payloads.
- Hex output helps compare binary payloads byte by byte.
- If decoding fails, verify whether the input is really CBOR and whether the selected format is correct.
CBOR and JSON checks before exchanging compact binary data
CBOR can preserve more structure than plain JSON, but tags, byte strings, map keys, and canonical encoding need explicit review.
Preserve data types
Review integers, floats, booleans, nulls, byte strings, arrays, and maps before treating decoded JSON as a complete representation.
Review tags and bytes
Check CBOR tags, binary payloads, dates, and application-specific values so important metadata is not flattened or lost.
Decide canonical encoding
Use deterministic or canonical CBOR when signatures, hashes, caching, or byte-for-byte comparisons depend on stable output.
Validate interoperability
Round-trip representative payloads through the systems that will actually read them, especially when multiple languages are involved.
Related tools
You may also find these tools useful.