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JSON Canonicalization (RFC 8785 JCS)
x402
JSON Canonicalization (RFC 8785 JCS) is a paid API for AI agents from data-tools.use.x402atlas.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).
Canonicalizes a JSON document using RFC 8785 JCS and returns the canonical text, its UTF-8 byte length, and a SHA-256 hash for integrity verification, signature preparation, and deduplication.
Price / call$0.01
Success—
StatusUnknown
How this service works
JSON canonicalization — canonicalize structured data with RFC 8785 JCS; return canonical JSON text, UTF-8 byte length and SHA-256 hash for integrity checks, signature preparation and deduplication. Uses binary64 rounding and strict Unicode/duplicate-key checks; rejects negative zero, overflow and nonzero underflow.
Output
Returns the RFC 8785 JCS canonical JSON text (deterministically ordered, whitespace-stripped), the UTF-8 byte length of that canonical representation, and a SHA-256 hash digest of the canonical bytes. Rejects inputs containing negative zero, numeric overflow, nonzero underflow, or duplicate object keys.
Example use cases
Digital signature payload preparation
“I need to sign a JSON invoice before sending it — can you canonicalize this JSON with RFC 8785 JCS and give me the SHA-256 hash I should sign? Here's the payload: {"invoiceId":"INV-2024-001","amount":250.00,"vendor":"Acme Corp","dueDate":"2024-12-31"}”
Deduplication of JSON records
“I'm ingesting JSON records from multiple sources and need to deduplicate them — can you canonicalize each of these JSON objects and give me their SHA-256 hashes so I can detect exact duplicates? Start with: {"orderId":"ORD-99","sku":"ABC123","qty":5}”
Integrity check before storage
“Before I store this configuration JSON in the database, I want to record its canonical form and SHA-256 fingerprint for later integrity auditing — please canonicalize it using JCS: {"env":"production","maxRetries":3,"timeout":30,"debug":false}”
Technical details
Endpoint
POSThttps://data-tools.use.x402atlas.com/json-canonicalize?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a standards-compliant RFC 8785 JCS canonical form of a JSON document — especially for cryptographic signing workflows, integrity fingerprinting, or content-addressed deduplication where byte-exact determinism is required. Prefer it over ad-hoc JSON serializers that do not guarantee key ordering or binary64 float rounding compliance.
Side effects
- Input contains negative zero (-0) — rejected per RFC 8785 strict mode
- Input contains a floating-point overflow or nonzero underflow value — rejected
- Input JSON has duplicate keys — rejected with an error
- Malformed or syntactically invalid JSON input — parse error returned
- Input is not a JSON object or array (bare primitives) — may be rejected depending on service constraints
Tags
x402
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