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JSON Repair Service
x402
JSON Repair Service is a paid API for AI agents from toolbelt402.tpoborne.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Fixes invalid, malformed, or truncated JSON strings and returns both the parsed object and the corrected JSON text, deterministically without an LLM.
Price / call$0.005
Success—
StatusUnknown
How this service works
Fix invalid, malformed, or truncated JSON — repairs trailing commas, single quotes, unquoted keys, and cut-off LLM output; returns the parsed object plus corrected JSON text. Deterministic, no LLM.
Output
Returns the successfully parsed JavaScript/JSON object along with the corrected, valid JSON string. If repair is possible, both the structured object and the fixed text are provided so the caller can use either form downstream.
Example use cases
Recovering truncated LLM output
“The model's response got cut off mid-JSON and now it won't parse — can you fix this broken JSON for me: {"users": [{"id": 1, "name": "Bob"}, {"id": 2, "name":”
Cleaning single-quoted JSON from legacy system
“Our legacy system exports JSON with single quotes and unquoted keys, and it's breaking our pipeline — can you repair this so it's valid JSON: {name: 'Alice', city: 'London', active: true}”
Fixing trailing-comma JSON in CI pipeline
“Our linter is failing because this config JSON has trailing commas everywhere — can you fix it and return the corrected text? Here: {"timeout": 30, "retries": 3, "debug": false,}”
Technical details
Endpoint
POSThttps://toolbelt402.tpoborne.workers.dev/json/repairWhen to prefer
Choose this endpoint when you have syntactically broken JSON — from LLM output, legacy systems, or manual editing — that needs deterministic, rule-based repair without invoking another LLM. Prefer it over LLM-based JSON fixing when you need reproducibility, low cost, and fast turnaround. It specifically excels at trailing commas, single-quoted strings, unquoted keys, and truncated output — common failure modes from generative AI pipelines.
Side effects
- Input is so corrupted it cannot be salvaged into valid JSON — returns an error indicating repair failure
- Input is not JSON-like at all (e.g. plain prose) — repair cannot proceed
- Extremely large JSON strings may hit payload size limits
- Network or worker timeout for unusually complex repair jobs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Possibly-broken JSON as a string |
Tags
x402
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