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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 truncated or malformed LLM-generated JSON (trailing commas, markdown fences, single quotes) to prevent crashes in 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://prompt-guard.agentdiet.dev/v1/llm-json-schema-healer)
Output
A repaired, syntactically valid JSON object derived from the malformed input, with issues like trailing commas, markdown code fences, single quotes, and truncation corrected deterministically.
Example use cases
Fix LLM output before downstream processing
“The LLM just returned this malformed JSON with trailing commas and markdown fences — can you repair it so I can pass it to the next step in my pipeline? Here's the raw output: ```json {"status": "ok", "items": [1, 2, 3,],} ```”
Recover truncated agent response JSON
“My agent's JSON response got cut off mid-string and now it won't parse. Can you heal this truncated JSON so the workflow doesn't crash? Raw string: {"user": "bob", "message": "hello wor”
Sanitize single-quoted JSON from legacy tool
“I'm getting single-quoted JSON from an older tool that my pipeline can't parse. Can you convert and fix this so it's valid JSON? Here it is: {'product': 'widget', 'price': 9.99, 'available': true,}”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/llm-json-schema-healer?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your multi-agent or LLM pipeline receives JSON outputs that frequently contain common syntax errors such as trailing commas, markdown code fences, or single quotes, and you need a deterministic (not heuristic or AI-based) repair to ensure pipeline reliability. Prefer this over writing custom sanitization logic or using general-purpose LLM re-prompting when you need fast, cheap, and predictable JSON normalization at $0.002 per call.
Side effects
- Input JSON is so severely malformed that deterministic repair is not possible — returns an error or best-effort partial result
- Input string is entirely non-JSON content with no recoverable structure
- Truncated JSON missing critical structural elements cannot be reliably completed
- Empty or whitespace-only raw_json input returns a validation error
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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