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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 JSON outputs (trailing commas, markdown fences, single quotes) so multi-agent pipelines never 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://prompt-guard.agentdiet.dev/v1/repair)
Output
Returns a repaired, valid JSON object derived from the malformed input — with trailing commas removed, markdown fences stripped, single quotes normalized to double quotes, and truncated structures closed where possible.
Example use cases
Repairing LLM pipeline JSON crashes
“This JSON string coming out of my language model keeps crashing my downstream parser — it has trailing commas and is wrapped in markdown code fences. Can you repair it so it's valid? Here it is: ```{"items": ["a", "b",], "count": 2}```”
Fixing single-quoted agent response JSON
“My agent returned JSON using single quotes instead of double quotes and now nothing can parse it. Can you fix this so it becomes proper JSON? Here's the string: {'user': 'bob', 'active': True}”
Recovering truncated LLM JSON output
“The LLM cut off mid-response and the JSON is truncated — it's missing the closing brackets. Can you deterministically repair this so I can continue processing it? The raw string is: {"results": [{"id": 1, "value": "foo"”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/repair?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your multi-agent pipeline receives LLM-generated JSON that fails standard parsing due to common issues like trailing commas, markdown code fences, single-quoted keys, or truncation. It is especially suited for deterministic, rule-based repair rather than AI-based guessing, making it reliable for production pipelines where consistency matters. Prefer it over manual regex hacks or custom parsers when you need a maintained, hosted solution with predictable behavior.
Side effects
- Input JSON is too severely malformed to deterministically repair — returns error indicating repair failure
- Missing required raw_json parameter — returns 400 bad request
- JSON is ambiguous in its truncation point — repair may not match original intent
- Payment not completed via x402 — returns 402 Payment Required
- Service unavailable or timeout — returns 5xx 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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