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JSON Auto-Fix API
x402
JSON Auto-Fix API is a paid API for AI agents from river-guestbook-newark-fails.trycloudflare.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-16).
Repairs malformed JSON by fixing trailing commas, single quotes, and unquoted keys, returning only valid JSON.
Price / call$0.005
Success—
StatusUnknown
How this service works
Fix broken JSON (trailing commas, single quotes, unquoted keys). Returns only valid JSON.
Output
A valid, corrected JSON object or array with all syntax errors resolved — trailing commas removed, single quotes replaced with double quotes, and unquoted keys properly quoted.
Example use cases
Fix LLM-generated malformed JSON
“This JSON response from the model has trailing commas and unquoted keys — can you repair it so it's valid and I can parse it in my app?”
Sanitize config file JSON
“My config file has a bunch of single-quoted strings and a trailing comma in the last array item — please fix it so it's proper JSON.”
Repair user-pasted JSON input
“A user pasted some JSON into my form but it's invalid — it's got unquoted keys and trailing commas everywhere. Can you clean it up and return valid JSON?”
Technical details
Endpoint
POSThttps://river-guestbook-newark-fails.trycloudflare.com/v1/json-fix?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap ($0.005 per call) automated fix for common JSON syntax errors like trailing commas, single quotes, or unquoted keys — especially useful in pipelines where LLM-generated or user-provided JSON is frequently malformed and needs to be made parseable before further processing.
Side effects
- JSON too malformed to repair — returns error if structure is unrecoverable
- Input is not JSON-like at all — may return validation error
- Ambiguous single-quote vs apostrophe context may lead to incorrect repair
- Empty input returns error
- Network timeout on Cloudflare tunnel if service is unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| usage | object | |
| choices | array |
Tags
x402
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