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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).
Deterministically repairs malformed, truncated, or markdown-wrapped JSON strings (trailing commas, single quotes, fences) so multi-agent pipelines never crash on bad LLM output.
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-repair)
Output
A repaired, valid JSON object reconstructed from the malformed input — with trailing commas removed, markdown fences stripped, single quotes normalized to double quotes, and truncated structures closed — ready for downstream parsing without errors.
Example use cases
Fix LLM output crashing agent pipeline
“My LLM just returned this JSON with trailing commas and single quotes and now my pipeline is crashing — can you repair it so it's valid? Here's the raw output: {'name': 'Bob', 'score': 42,}”
Strip markdown fences from AI response
“The model wrapped its JSON response in triple backticks again and my parser can't handle it. Can you clean it up and give me valid JSON? The raw string is: ```json
{"status": "ok", "count": 5}
```”
Recover truncated JSON from partial generation
“The LLM stopped mid-generation and I got a truncated JSON object. Can you repair it and fill in what's structurally needed to make it valid? Here's the broken fragment: {"items": [{"id": 1, "name": "widget"”
Technical details
Endpoint
GEThttps://mcp-security.agentdiet.dev/v1/json-repair?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your multi-agent pipeline receives raw LLM-generated JSON that may be malformed, truncated, or wrapped in markdown fences and you need a deterministic (non-AI) repair that won't hallucinate new fields. Prefer over regex heuristics or custom parsers when you want a single reliable API call that handles the full spectrum of common LLM JSON failures including trailing commas, single quotes, and incomplete structures.
Side effects
- Input is so corrupted that no deterministic repair is possible — returns error or best-effort partial object
- Input string is empty or missing (raw_json not provided) — returns 400 validation error
- JSON is semantically ambiguous after repair (e.g. missing values cannot be inferred) — may return null-padded or incomplete structure
- Payment not included or insufficient — returns HTTP 402 payment required
- Network timeout on the endpoint — no response
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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