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CanaryGuard JSON Repair & Sanitize
x402
CanaryGuard JSON Repair & Sanitize is a paid API for AI agents from canaryguard-402.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).
Deterministically repairs malformed or truncated LLM JSON payloads and scrubs embedded prompt-injection content from the repaired output.
Price / call$0.01
Success—
StatusUnknown
How this service works
Deterministically repairs malformed or truncated LLM JSON payloads (missing quotes, trailing commas, markdown fences) while scrubbing embedded prompt-injection payloads.
Output
A repaired and sanitized JSON object with all syntax errors corrected (missing quotes, trailing commas, markdown fences, truncation) and any embedded prompt-injection payloads scrubbed, ready for safe downstream parsing.
Example use cases
Fixing truncated LLM API responses
“The model's JSON response got cut off mid-object and has unclosed brackets and missing quotes — can you repair this raw string so I can parse it without crashing my pipeline?”
Stripping prompt injection from agent input
“I received this JSON payload from an untrusted source and I'm worried it has prompt-injection instructions embedded in the values — can you sanitize it before I pass it to my agent?”
Cleaning markdown-wrapped JSON from chat models
“The LLM wrapped its JSON response in triple-backtick markdown fences and added trailing commas — can you strip the fences, fix the syntax, and give me a clean parseable JSON object?”
Technical details
Endpoint
GEThttps://canaryguard-402.onrender.com/v1/json-repair-and-sanitize?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic, rule-based JSON repair rather than LLM-based regeneration — particularly when the payload may contain adversarial prompt-injection content that must be scrubbed before any LLM processes the data. Ideal for agentic pipelines where untrusted or LLM-generated JSON must be safely parsed without re-invoking a model.
Side effects
- Input JSON is so corrupted that deterministic repair is impossible — returns an error indicating irrecoverable malformation
- Non-JSON content submitted as raw_json — returns validation error
- Payload exceeds size limits — returns a size or timeout error
- Missing required 'raw_json' field — returns a schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| raw_json | string |
Tags
x402
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