24K Labs JSON Repair

x402

24K Labs JSON Repair is a paid API for AI agents from api.24klabs.ai, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-14).

Fixes malformed or truncated JSON (trailing commas, unquoted keys, cut-off LLM output) into valid, parseable JSON.

Price / call$0.008

Seller volume →—

Success—

StatusUnknown

How this service works

Fix malformed or truncated JSON (trailing commas, unquoted keys, cut-off LLM output) into valid, parseable JSON.

Output

Returns a valid, parseable JSON string with all syntax errors corrected — trailing commas removed, unquoted keys properly quoted, truncated structures closed, and any other malformations resolved.

Example use cases

Fix truncated LLM pipeline output

“My AI model returned this JSON but it got cut off mid-response and won't parse — can you repair it and give me back valid JSON? Here's the broken string: {"users": [{"id": 1, "name": "Bob"”

Clean JSON with trailing commas

“I have this JSON object with trailing commas that keeps throwing parse errors: {"color": "red", "size": "large",} — can you fix it so it's valid?”

Repair JSON with unquoted keys

“This config JSON came back with unquoted keys and it's failing validation: {host: "localhost", port: 8080, debug: true} — please fix it into proper valid JSON.”

Technical details

Endpoint

POSThttps://api.24klabs.ai/api/v1/json-repair

When to prefer

Choose this endpoint when you need to recover malformed or truncated JSON programmatically, especially when dealing with LLM-generated output that may be cut off or contain common syntax errors like trailing commas or unquoted keys. Prefer it over manual string manipulation when the JSON structure is complex or the error type is unpredictable.

Side effects

Input is so severely truncated that the intended structure cannot be inferred — returns best-effort repair or error
Input is not JSON at all (e.g. plain text or XML) — may return an error or unrecognized format response
Ambiguous repair cases where multiple valid completions exist — endpoint picks one heuristically, which may not match original intent
Network or service unavailability returns a 5xx error

Input

Schema · Request body

Field	Type	Description
json	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "repaired": {
      "name": "Bob"
    }
  }
}

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How this service works

Fix malformed or truncated JSON (trailing commas, unquoted keys, cut-off LLM output) into valid, parseable JSON.

Output

Returns a valid, parseable JSON string with all syntax errors corrected — trailing commas removed, unquoted keys properly quoted, truncated structures closed, and any other malformations resolved.

Example use cases

Fix truncated LLM pipeline output

“My AI model returned this JSON but it got cut off mid-response and won't parse — can you repair it and give me back valid JSON? Here's the broken string: {"users": [{"id": 1, "name": "Bob"”

Clean JSON with trailing commas

“I have this JSON object with trailing commas that keeps throwing parse errors: {"color": "red", "size": "large",} — can you fix it so it's valid?”

Repair JSON with unquoted keys

“This config JSON came back with unquoted keys and it's failing validation: {host: "localhost", port: 8080, debug: true} — please fix it into proper valid JSON.”

Technical details

Endpoint

POSThttps://api.24klabs.ai/api/v1/json-repair

When to prefer

Side effects

Input is so severely truncated that the intended structure cannot be inferred — returns best-effort repair or error
Input is not JSON at all (e.g. plain text or XML) — may return an error or unrecognized format response
Ambiguous repair cases where multiple valid completions exist — endpoint picks one heuristically, which may not match original intent
Network or service unavailability returns a 5xx error

Input

Schema · Request body

Field	Type	Description
json	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "repaired": {
      "name": "Bob"
    }
  }
}