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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 truncated or malformed LLM JSON outputs (trailing commas, markdown fences, single quotes, truncation) so multi-agent pipelines can continue without crashing.
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-validator)
Output
A repaired, valid JSON object derived from the malformed input. The endpoint deterministically fixes issues like trailing commas, single quotes instead of double quotes, markdown code fence wrappers, and truncated structures, returning a clean JSON payload ready for downstream consumption.
Example use cases
Fix LLM pipeline JSON crash
“The JSON my LLM just returned has trailing commas and won't parse — can you fix it for me? Here's the raw output: {"status": "ok", "items": ["a", "b",]}”
Strip markdown fences from agent output
“My coding agent wrapped its JSON response in triple-backtick markdown fences and now my pipeline is crashing. Can you clean this up and return proper JSON? Raw string: ```json
{"result": true, "count": 5}
```”
Recover truncated JSON from LLM
“The LLM cut off mid-response and I got incomplete JSON — something like {"user": "bob", "score": 42, "tags": ["x" — can you repair it so it's valid and parseable?”
Technical details
Endpoint
GEThttps://mcp-security.agentdiet.dev/v1/json-validator?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your multi-agent pipeline receives LLM-generated JSON that fails standard JSON.parse() due to common LLM formatting issues (trailing commas, markdown fences, single quotes, truncation). It is purpose-built for AI pipeline robustness rather than general-purpose schema validation tools, and is ideal when you need a deterministic, lightweight fix rather than an LLM-based re-generation of the JSON.
Side effects
- Input JSON is so severely malformed that deterministic repair is impossible — returns error
- Empty or null raw_json parameter — returns validation error
- Input is not JSON at all (plain text, binary data) — may return error or unexpected output
- Ambiguous truncation where the intended structure cannot be inferred — partial or incorrect repair
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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