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24K Labs JSON Schema Validator
x402
24K Labs JSON Schema Validator is a paid API for AI agents from api.24klabs.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Validates a JSON instance against a JSON Schema (draft 7 / 2020-12 subset) and returns a valid flag with per-field errors including codes and JSONPath locations.
Price / call$0.002
Success—
StatusUnknown
How this service works
Validate a JSON instance against a JSON Schema (draft 7 / 2020-12 subset); returns a valid flag plus per-field errors with codes and JSONPath.
Output
Returns a JSON object containing a boolean 'valid' flag indicating overall schema compliance, plus an array of per-field error objects each with an error code, a human-readable message, and a JSONPath string pointing to the exact failing location in the instance.
Example use cases
API request body pre-flight check
“Before I send this payload to our orders API, validate it against our draft-7 schema — the instance has {"orderId":123,"items":[]} and the schema requires items to be a non-empty array. Tell me which fields fail and why.”
CI pipeline data contract enforcement
“In my CI pipeline I need to check that this generated config JSON matches our 2020-12 schema — run the validation and return all per-field errors with JSONPath so I can fail the build if anything's wrong.”
User-submitted form data validation
“A user just submitted a registration form and I got this JSON back: {"email":"not-an-email","age":-1}. Validate it against our user schema (draft 7) and return the list of validation errors with field paths so I can show them the right error messages.”
Technical details
Endpoint
POSThttps://api.24klabs.ai/api/v1/jsonschema-validateWhen to prefer
Choose this endpoint when you need per-field JSONPath-level error detail from a draft-7 or 2020-12 JSON Schema validation — especially useful in agent pipelines, CI/CD data contract checks, or form validation flows where you need structured, machine-readable error codes rather than a pass/fail only. Prefer over generic validators when you need the exact failing path and error code for downstream error handling or user feedback.
Side effects
- Malformed JSON instance causes a parse error response
- Invalid or unrecognized JSON Schema syntax returns a schema-error response
- Use of JSON Schema features outside the draft 7 / 2020-12 subset may return unsupported-keyword errors
- Empty or missing request body returns a 400 bad request
- Extremely deeply nested schemas may time out or hit size limits
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| schema | object | |
| instance | object |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true,
"errors": []
}
}Tags
x402
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