AgentJSON Fix

x402

AgentJSON Fix is a paid API for AI agents from agentjson-fix-km.fly.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).

Deterministically repairs malformed or LLM-style JSON strings into valid, parseable JSON, with optional schema validation.

Price / call$0.005

Seller volume →—

Success—

StatusUnknown

How this service works

Deterministic repair of broken or LLM-style JSON into valid JSON, $0.005 per call via x402.

Output

Returns a JSON object with an 'ok' boolean indicating success, the repaired 'json' value as a parsed object, and a 'repairs' array listing each type of fix applied (e.g. single_quotes converted, trailing_commas removed). If schema validation is enabled and strict mode is on, returns ok:false on validation failure.

Example use cases

Sanitize LLM chatbot output

“The AI assistant returned this JSON with single quotes and a trailing comma that's breaking my parser: {'user': 'alice', 'score': 42,} — can you repair it into valid JSON?”

Validate fixed JSON against a schema

“Fix this malformed JSON and then check it against my schema to make sure the result has the right shape: {name: 'Bob', age: 30,} — run it in strict mode so I know right away if the schema doesn't match.”

Clean up agent pipeline output

“My automation pipeline is producing JSON like {"items": [1, 2, 3,], "status": 'ok'} that keeps crashing downstream steps — can you deterministically repair it into something parseable?”

Technical details

Endpoint

GEThttps://agentjson-fix-km.fly.dev/v0/json/fix?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need fast, deterministic, rule-based JSON repair without relying on another LLM call. It is especially suited for fixing LLM-generated JSON that has predictable issues like single quotes, trailing commas, or unquoted keys. Prefer it over regex hacks or manual parsing logic when you want a consistent, auditable repair log. It also supports optional JSON Schema validation in one call, making it useful in pipelines that need both repair and conformance checking.

Side effects

JSON is so deeply malformed it cannot be deterministically repaired — returns ok:false
Schema validation fails in strict mode — returns ok:false with validation details
Missing required 'raw' parameter — returns an error response
Input is not a string — request rejected
Schema object itself is malformed — validation step may be skipped or error returned

Input

Schema · Request body

Field	Type	Description
raw	string	Malformed or LLM-ish JSON text to repair (required)
schema	object	Optional JSON Schema object to validate the repaired value
strict	boolean	If true, schema validation failures return ok:false; default false

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "json": {
      "ok": true,
      "name": "agent"
    },
    "repairs": [
      {
        "type": "single_quotes",
        "detail": "converted 2"
      },
      {
        "type": "trailing_commas",
        "detail": "removed 1"
      }
    ]
  }
}

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How this service works

Deterministic repair of broken or LLM-style JSON into valid JSON, $0.005 per call via x402.

Output

Example use cases

Sanitize LLM chatbot output

“The AI assistant returned this JSON with single quotes and a trailing comma that's breaking my parser: {'user': 'alice', 'score': 42,} — can you repair it into valid JSON?”

Validate fixed JSON against a schema

Clean up agent pipeline output

“My automation pipeline is producing JSON like {"items": [1, 2, 3,], "status": 'ok'} that keeps crashing downstream steps — can you deterministically repair it into something parseable?”

Technical details

Endpoint

GEThttps://agentjson-fix-km.fly.dev/v0/json/fix?utm_source=zero.xyz

When to prefer

Side effects

JSON is so deeply malformed it cannot be deterministically repaired — returns ok:false
Schema validation fails in strict mode — returns ok:false with validation details
Missing required 'raw' parameter — returns an error response
Input is not a string — request rejected
Schema object itself is malformed — validation step may be skipped or error returned

Input

Schema · Request body

Field	Type	Description
raw	string	Malformed or LLM-ish JSON text to repair (required)
schema	object	Optional JSON Schema object to validate the repaired value
strict	boolean	If true, schema validation failures return ok:false; default false

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "json": {
      "ok": true,
      "name": "agent"
    },
    "repairs": [
      {
        "type": "single_quotes",
        "detail": "converted 2"
      },
      {
        "type": "trailing_commas",
        "detail": "removed 1"
      }
    ]
  }
}