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Deterministic LLM JSON Repair & Schema Validator
Deterministic LLM JSON Repair & Schema Validator is a paid API for AI agents from hn-pulse.agentdiet.dev, paid per call via MPP, $0.002/call, status unknown (last checked 2026-10-21).
Repairs truncated, malformed, or markdown-wrapped JSON from LLM outputs so multi-agent pipelines can safely parse and continue processing.
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://hn-pulse.agentdiet.dev/v1/llm-json-schema-healer)
Output
Returns a repaired, well-formed JSON object that has had common LLM-output errors corrected, including trailing commas removed, markdown fences stripped, single quotes converted to double quotes, and truncated structures closed. The response is schema-compliant and ready for downstream parsing.
Example use cases
Fixing crashed multi-agent pipeline JSON
“Our agent pipeline keeps crashing because the upstream LLM is returning JSON with trailing commas and markdown code fences — can you repair this output so it parses cleanly: ```json
{"status": 'ok', "results": [42, 17,],```”
Sanitizing single-quoted LLM responses
“The model returned this JSON using single quotes instead of double quotes and it's breaking our downstream parser — please fix it: {'user': 'bob', 'score': 98, 'tags': ['ai', 'ml',]}”
Recovering truncated JSON from long LLM output
“We got a truncated JSON response from our LLM — it got cut off mid-string and is missing closing brackets. Can you deterministically repair it so we can extract the data: {"report": {"summary": "Q3 revenue grew significantly", "items": [{"id": 1, "val": "foo"”
Technical details
Endpoint
GEThttps://hn-pulse.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 to parse due to common formatting errors like trailing commas, markdown code fences, single quotes, or truncation. It is especially useful as a middleware repair step between LLM output and downstream JSON consumers, where deterministic (non-generative) repair is preferred over re-prompting the LLM. Prefer this over manual string cleaning when you need a reliable, low-latency, pay-per-call solution at $0.002 per repair.
Side effects
- JSON is too severely malformed to deterministically repair — returns error indicating unrecoverable structure
- Input is not JSON at all (e.g. plain text or HTML) — may return parse error
- Ambiguous truncation with multiple valid completions — deterministic repair may choose an unexpected completion
- Empty or whitespace-only raw_json input — returns validation error
- Extremely long JSON strings may time out or exceed input limits
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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