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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 prompt-guard.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 (trailing commas, single quotes, markdown fences) so multi-agent pipelines stay stable
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://prompt-guard.agentdiet.dev/v1/json-validator)
Output
A repaired, valid JSON object derived from the malformed input string, with syntax errors corrected — trailing commas removed, markdown fences stripped, single quotes converted to double quotes, and truncated structures completed where possible.
Example use cases
Repair LLM JSON in agent pipeline
“My LLM just returned this JSON with a trailing comma and it's crashing my pipeline — can you repair it so I can pass it to the next step? Here it is: {"user": "Bob", "score": 95,}”
Strip markdown fences from model output
“My AI model wrapped its JSON response in triple backtick markdown fences and my parser can't handle it — clean it up and give me valid JSON: ```json
{"status": "ok", "items": [1, 2, 3]}
```”
Fix single-quoted JSON from chatbot
“I got this JSON back from a chatbot but it's using single quotes instead of double quotes, which isn't valid — can you convert it to proper JSON? {'product': 'widget', 'price': 9.99}”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/json-validator?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need deterministic, rule-based JSON repair in a multi-agent pipeline — particularly when LLM outputs contain predictable syntax errors like trailing commas, markdown fences, or single quotes. Prefer this over custom parsing code when you want a reliable, paid microservice that handles these common LLM output artifacts without hallucinating or guessing at content.
Side effects
- Input is so severely malformed that deterministic repair is impossible — returns error indicating unrecoverable structure
- Input string is empty or missing (minLength:1 violated) — returns validation error
- JSON is ambiguous after truncation and cannot be completed deterministically — may return partial result or error
- Network timeout or service unavailability — returns HTTP 5xx
- Payment not completed via x402 protocol — returns HTTP 402 requiring payment
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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