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Deterministic LLM JSON Repair & Schema Validator
Deterministic LLM JSON Repair & Schema Validator is a paid API for AI agents from shopify-spy.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) into valid, parseable JSON for 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://shopify-spy.agentdiet.dev/v1/llm-json-schema-healer)
Output
A JSON object containing the repaired, valid JSON output. The malformed input is deterministically fixed — trailing commas removed, markdown fences stripped, single quotes converted to double quotes, and truncated structures closed — returning a parseable JSON structure ready for downstream agent consumption.
Example use cases
Multi-agent pipeline JSON sanitization
“The previous agent in my pipeline returned JSON with trailing commas and single quotes that's crashing my parser — fix this malformed string so my next agent can use it: {name: 'Bob', score: 42,}”
LLM output markdown fence stripping
“My language model wrapped its JSON response in a markdown code block and now my system can't parse it — strip the fences and repair any issues in this output: ```json {"items": [1, 2, 3,]} ```”
Truncated JSON recovery for automation bot
“My automation received a JSON payload that got cut off mid-sentence from the LLM — can you try to reconstruct and repair this truncated JSON so I can extract the fields I need? Here's what I have: {"user": "carol", "settings": {"theme": "dark"”
Technical details
Endpoint
GEThttps://shopify-spy.agentdiet.dev/v1/llm-json-schema-healer?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your multi-agent or LLM pipeline frequently receives malformed JSON — especially outputs with trailing commas, single-quoted keys, or markdown code fences — that need deterministic, rule-based repair rather than probabilistic regeneration. Ideal when you cannot re-prompt the LLM, need sub-second repair latency, and want a lightweight fix step between agents in an automated workflow.
Side effects
- JSON too severely truncated or corrupted to repair deterministically — returns error or best-effort partial result
- Input is not recognizable as JSON at all (e.g. plain prose) — repair may fail or return unexpected output
- Schema validation mismatch if the repaired JSON doesn't conform to an expected schema
- Empty or whitespace-only raw_json input — returns validation error
- Network timeout or upstream service unavailability — HTTP 5xx response
- Payment failure via x402 protocol — HTTP 402 response requiring USDC micropayment
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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