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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 mcp-security.agentdiet.dev, paid per call via MPP, $0.002/call, status unknown (last checked 2026-10-21).
Repairs malformed, truncated, or markdown-wrapped LLM JSON outputs into valid JSON so multi-agent pipelines don't crash
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://mcp-security.agentdiet.dev/v1/json-fix)
Output
Returns a JSON object containing the repaired, syntactically valid JSON parsed from the malformed input string, with common issues like trailing commas, markdown code fences, single quotes, and truncation corrected deterministically.
Example use cases
Fix LLM pipeline JSON crashes
“My agent pipeline keeps crashing because the LLM keeps returning JSON with trailing commas and markdown fences — can you repair this output so I can safely pass it to the next step? Here it is: ```{"status": "ok", "results": ["a", "b",]}```”
Recover truncated JSON generation
“The model generated this JSON but it got cut off before finishing — can you repair it into valid JSON? The raw string is: {"user": "bob", "score": 42, "meta": {"tags": ["premium"”
Sanitize single-quoted JSON from scraper
“I scraped some data and the JSON came back using single quotes instead of double quotes and it won't parse — fix this string into valid JSON: {'product': 'Widget', 'price': 9.99, 'available': True}”
Technical details
Endpoint
GEThttps://mcp-security.agentdiet.dev/v1/json-fix?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your multi-agent pipeline receives raw LLM-generated JSON that may be truncated, contain trailing commas, markdown fences, or single quotes, and you need a deterministic (not AI-based) repair that is fast, cheap ($0.002/call), and safe to run in a hot path without risking hallucinated data. Prefer it over writing custom regex sanitizers or re-prompting the LLM, which wastes tokens and latency.
Side effects
- Input JSON is so severely malformed that deterministic repair is impossible — returns error
- Input string is completely empty or whitespace — validation fails
- JSON structure is ambiguous after truncation and cannot be reliably completed — partial repair or error returned
- Payment not fulfilled (HTTP 402) — request blocked until x402 micropayment is settled
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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