CBOR Inspector — Parse Hex Streams and Decode Binary Object Primitives
Decode CBOR binary data from hex or base64 input to a JSON view for debugging IoT and WebAuthn payloads. Shows per-token type annotations with byte offsets in the bytes view. 100% client-side and free.
How to Use CBOR Inspector — Parse Hex Streams and Decode Binary Object Primitives
How to Use the CBOR Data Inspector
Step 1: Paste Your CBOR Data
Paste hex-encoded or base64-encoded CBOR bytes into the input panel. The tool accepts:
- Hex with spaces:
a3 64 6e 61 6d 65 65 41 6c 69 63 65 - Hex compact:
a3646e616d656541 6c6963 65 - Hex with 0x prefix:
0xa3 0x64 0x6e 0x61 - Base64:
o2RuYW1lZUFsaWNl
Use the Format toggle to force a specific encoding or leave it on Auto to let the tool detect it.
Step 2: Inspect the Output
Two tabs are available:
JSON Output
The decoded CBOR value as pretty-printed JSON. Byte strings appear as h' notation (e.g. "h'deadbeef'").
Bytes View
A token-by-token breakdown showing:
| Column | Description |
|---|---|
| Offset | Byte position of this token in hex |
| Header | The CBOR header bytes (initial byte + length bytes) |
| Type | CBOR major type: uint, nint, bstr, tstr, array, map, float32, true, false, null, tag:… |
| Value | Decoded value or structure descriptor |
Nested items are indented with └ markers to show map keys and array elements.
CBOR Type Reference
| Major Type | CBOR Type | JSON Equivalent |
|---|---|---|
| 0 | uint | Number (unsigned) |
| 1 | nint | Number (negative) |
| 2 | bstr | h'<hex>' string |
| 3 | tstr | String |
| 4 | array | Array |
| 5 | map | Object |
| 6 | tag(n) | Transparent wrapper |
| 7 | true/false/null | Boolean/null |
| 7 | float16/32/64 | Number (float) |
Common Use Cases
- WebAuthn debugging: Decode
authData,attStmt, and attestation objects fromnavigator.credentials.create()responses - IoT payloads: Inspect CBOR-encoded sensor readings from CoAP or MQTT streams
- COSE messages: Decode signed/encrypted CBOR Object Signing and Encryption messages
- CBOR-LD: Inspect JSON-LD documents encoded as CBOR
Frequently Asked Questions
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