jsonfix — Malformed JSON Repair API

x402

jsonfix — Malformed JSON Repair API is a paid API for AI agents from ngmi--b088743456a711f1b5c3ee650bb23af1.web.val.run, paid per call via x402, $0.01/call, status down (last checked 2026-10-13).

Repairs malformed JSON strings using a deterministic parser with LLM fallback, optionally validating output against a provided JSON Schema.

Price / call$0.01

Seller volume →—

Success—

StatusDown

How this service works

Paid HTTP API that repairs malformed JSON. Deterministic parser + LLM fallback. Pay-per-request via x402 USDC. Zero data retention.

Output

Returns a JSON object with: 'ok' (boolean success flag), 'data' (the repaired JSON value), 'model' (null if deterministic, model name if LLM was used), 'valid' (whether output passes the provided schema), 'method' ('deterministic' or 'llm'), and 'validationErrors' (array of schema violations if any).

Example use cases

Clean up LLM-generated structured output

“The model just generated some JSON for a database record but it has syntax errors — missing quotes around keys and a trailing comma. Can you fix it and make sure it matches this schema: {"type":"object","properties":{"id":{"type":"string"},"created_at":{"type":"string"},"tags":{"type":"array"}}}”

Repair scraped data before import

“I scraped some product data from a website and got back malformed JSON with unescaped quotes and missing commas between fields. Can you fix it and validate it passes this structure: {"type":"object","properties":{"title":{"type":"string"},"price":{"type":"number"},"description":{"type":"string"}}}”

Recover broken legacy system export

“Our old system exported a JSON dump with bad formatting — lots of missing quotes, mangled escape sequences, and type mismatches. Can you repair it and check if it validates against our schema before we load it into the new database?”

Technical details

Endpoint

POSThttps://ngmi--b088743456a711f1b5c3ee650bb23af1.web.val.run/repair?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need reliable, pay-per-use JSON repair without storing sensitive data — especially useful when dealing with LLM-generated JSON, scraped data, or legacy system outputs that frequently produce near-valid but broken JSON. The deterministic-first approach means fast, cheap repairs for common syntax errors, with LLM fallback only when needed. Zero data retention makes it suitable for sensitive payloads.

Side effects

Input exceeds 100,000 character limit — request rejected
JSON is so severely malformed that neither deterministic parser nor LLM can reconstruct it — ok:false returned
Provided JSON Schema is invalid or unsupported draft — validation step fails
LLM fallback unavailable or timed out — service error
Payment not fulfilled via x402 — 402 Payment Required response

Input

Schema · Request body

Field	Type	Description
input	—	Malformed JSON as a string, OR any JSON value to validate against `schema`. Required. Max 100,000 characters.
schema	object	Optional JSON Schema (Ajv draft-07+). When provided, the repaired output is validated; deterministic results that fail validation fall through to the LLM.
instructions	string	Optional natural-language hint passed to the LLM fallback. Example: 'coerce dates to ISO 8601' or 'use null for unknown fields'.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "data": {
      "a": 1,
      "name": "bob"
    },
    "model": null,
    "valid": true,
    "method": "deterministic",
    "validationErrors": []
  }
}

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How this service works

Paid HTTP API that repairs malformed JSON. Deterministic parser + LLM fallback. Pay-per-request via x402 USDC. Zero data retention.

Output

Example use cases

Clean up LLM-generated structured output

Repair scraped data before import

Recover broken legacy system export

Technical details

Endpoint

POSThttps://ngmi--b088743456a711f1b5c3ee650bb23af1.web.val.run/repair?utm_source=zero.xyz

When to prefer

Side effects

Input exceeds 100,000 character limit — request rejected
JSON is so severely malformed that neither deterministic parser nor LLM can reconstruct it — ok:false returned
Provided JSON Schema is invalid or unsupported draft — validation step fails
LLM fallback unavailable or timed out — service error
Payment not fulfilled via x402 — 402 Payment Required response

Input

Schema · Request body

Field	Type	Description
input	—	Malformed JSON as a string, OR any JSON value to validate against `schema`. Required. Max 100,000 characters.
schema	object	Optional JSON Schema (Ajv draft-07+). When provided, the repaired output is validated; deterministic results that fail validation fall through to the LLM.
instructions	string	Optional natural-language hint passed to the LLM fallback. Example: 'coerce dates to ISO 8601' or 'use null for unknown fields'.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "data": {
      "a": 1,
      "name": "bob"
    },
    "model": null,
    "valid": true,
    "method": "deterministic",
    "validationErrors": []
  }
}