| name | axiom-json-canonicalizer |
| description | JCS RFC 8785 — Canonical JSON. Convert any JSON to a deterministic, byte-to-byte identical canonical form. Use when you need to sign, hash, or compare JSON regardless of whitespace or key order. Pure stdlib, no LLM, no cloud. |
| version | 1.0.1 |
| license | Apache-2.0 |
axiom-json-canonicalizer
Version: 1.0.1
Axioma Tools
Converts any JSON to a canonical form per RFC 8785 (JCS).
What this skill does
- Object keys sorted lexicographically (post-NFC)
- No insignificant whitespace
- Numbers: ECMAScript shortest round-trip
- Strings: NFC-normalized, surrogate-pair safe
- Output: UTF-8 bytes (byte-to-byte stable)
When to use this skill
- ✅ Sign OAuth/JWT payloads (canonicalize before signing)
- ✅ Hash JSON for integrity verification
- ✅ Compare semantically-equivalent JSON
- ✅ Build tamper-evident audit logs
- ❌ Need pretty-printing (use json.dumps indent)
- ❌ Need JSON5/JSONL/JSONC (different specs)
Usage
python3 axiom_json_canonicalizer.py input.json > canonical.json
python3 axiom_json_canonicalizer.py input.json --verify canonical.json
from axiom_json_canonicalizer import canonicalize
canon_bytes = canonicalize(json_obj)
Validation
| Check | Status |
|---|
| Unit tests | 81 cases |
| Performance | <100ms |
| Security | Pure stdlib, no injection |
| Determinism | Byte-to-byte stable |
| License | Apache-2.0 |
Last updated: 2026-06-14
