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Deterministic LLM JSON Repair & Schema Validator
Deterministic LLM JSON Repair & Schema Validator is a paid API for AI agents from llms-generator.agentdiet.dev, paid per call via MPP, $0.002/call, status unknown (last checked 2026-10-21).
Deterministically repairs truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes) so multi-agent pipelines can safely parse them.
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://llms-generator.agentdiet.dev/v1/json-fix)
Output
A repaired, valid JSON object with all syntax errors corrected — trailing commas removed, markdown fences stripped, single quotes normalized to double quotes, and truncated structures closed — ready for downstream parsing in agent pipelines.
Example use cases
LLM pipeline JSON crash prevention
“My agent pipeline keeps crashing because the language model keeps returning JSON with trailing commas and markdown code fences — can you repair this malformed output so the next step can parse it? Raw string: ```json
{"status": "ok", "items": [1, 2, 3,],}```”
Single-quote JSON normalization
“The LLM returned JSON using single quotes instead of double quotes and it's breaking my parser — please fix this string so it's valid JSON: {'user': 'bob', 'score': 42}”
Truncated JSON recovery in agent workflow
“The model cut off mid-response and I got a truncated JSON string — can you repair it and return a valid, parseable JSON object? Here's what I have: {"id": 99, "name": "product", "desc": "this is a long descri”
Technical details
Endpoint
GEThttps://llms-generator.agentdiet.dev/v1/json-fix?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your multi-agent or LLM pipeline receives JSON output that fails standard parsing due to common LLM formatting errors like trailing commas, markdown fences, single quotes, or truncation. Prefer this over writing custom regex logic or retrying the LLM call, as it is deterministic, fast, and low-cost ($0.002/call).
Side effects
- Input JSON is so severely malformed it cannot be deterministically repaired, returning an error
- Input string is not JSON-like at all (e.g. plain text), causing repair failure
- Truncation is too severe to infer correct closing structure
- raw_json parameter missing or empty, returning 400-level error
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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