# Deterministic A2A Broken-JSON Repair & Schema Validator

> Deterministic A2A Broken-JSON Repair & Schema Validator is a paid API for AI agents from preflight.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 can process them without crashing

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/json-repair?utm_source=zero.xyz
- Price: $0.002/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-deterministic-a2a-broken-json-repair-schema-1d25665d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DFTmjpq4cVWcnhqKNy-iM

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability preflight-agentdiet-dev-deterministic-a2a-broken-json-repair-schema-1d25665d
```

Example prompt: The LLM just returned this broken JSON with trailing commas and markdown fences — can you repair it so I can parse it: ```{"name": "Alice", "age": 30,}```

## When to prefer this

Choose this endpoint when your agent pipeline receives JSON from an LLM or another agent and needs a lightweight, deterministic fix before downstream parsing — especially when you need predictable, rule-based repair rather than an LLM-based rewrite. Ideal for high-volume, low-latency pipelines where reliability and cost predictability matter.

## Known failure modes

- Input JSON is too severely malformed to deterministically repair — returns an error indicating repair was not possible
- Input string contains no JSON-like structure at all
- Repaired output may differ semantically if truncation required guessing at missing values
- Request missing the required raw_json parameter returns a validation error

## 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://preflight.agentdiet.dev/v1/json-repair)

## Output

Returns a repaired, valid JSON object that has been cleaned of common LLM-introduced syntax errors including trailing commas, markdown code fences, single-quoted strings, and truncation artifacts

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "raw_json"
 ],
 "properties": {
  "raw_json": {
   "type": "string",
   "minLength": 1,
   "description": "Malformed, truncated, or markdown-wrapped JSON string to deterministically repair"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/preflight-agentdiet-dev-deterministic-a2a-broken-json-repair-schema-1d25665d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)