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Deterministic A2A Broken-JSON Repair & Schema Validator
Deterministic A2A Broken-JSON Repair & Schema Validator is a paid API for AI agents from preflight.agentdiet.dev, paid per call via MPP, $0.002/call, status unknown (last checked 2026-10-21).
Repairs truncated or malformed LLM-generated JSON (trailing commas, markdown fences, single quotes) and validates it for use in multi-agent pipelines.
Price / call$0.002
Success—
StatusUnknown
How this service works
Repairs truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes) so multi-agent pipelines never crash. (Live x402 v2, IETF MPP & MCP endpoint at https://preflight.agentdiet.dev/v1/llm-json-schema-healer)
Output
A JSON object containing the repaired, valid JSON output derived from the malformed input, suitable for direct use in downstream agent pipeline steps.
Example use cases
LLM output repair in agent pipeline
“The model just returned this JSON but it's wrapped in markdown and has a trailing comma: ```{"status": "ok", "score": 0.95,}``` — can you clean it up and give me valid JSON?”
Single-quote JSON normalization
“I got this from a Python agent that used single quotes instead of double quotes: {'user': 'bob', 'active': true} — can you convert it to proper JSON?”
Truncated JSON recovery
“My LLM response got cut off mid-stream and the JSON is incomplete — here's what I have: {"results": [{"id": 1, "name": "foo"} — can you try to repair and close it out?”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/llm-json-schema-healer?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your multi-agent pipeline receives LLM-generated JSON that fails standard JSON.parse() due to common LLM formatting errors like trailing commas, markdown code fences, or single quotes. Prefer it over generic JSON libraries when you need a hosted, pay-per-call repair service that handles the full set of LLM-specific JSON pathologies without writing custom preprocessing logic.
Side effects
- Input JSON too severely truncated to deterministically reconstruct — returns error or best-effort partial repair
- Input string is not JSON-like at all — may return validation error
- Ambiguous structure where multiple valid repairs are possible — deterministic approach picks one branch which may not match original intent
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| raw_jsonrequired | string | Malformed, truncated, or markdown-wrapped JSON string to deterministically repair |
Output
Schema · Response
{
"type": "object"
}Reviews
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