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agent402.tools JSON Schema Validator
x402
agent402.tools JSON Schema Validator is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates a JSON document against a JSON Schema (draft-07 subset) and returns a list of violations
Price / call$0.001
Success—
StatusUnknown
How this service works
Validate a JSON document against a JSON Schema (draft-07 subset) and get the list of violations. Supports type, required, properties, items, enum, const, min/max, length, pattern, format, anyOf/allOf/oneOf/not, additionalProperties. Deterministic - check an agent's structured output before you trust it.
Output
A deterministic list of schema violations found in the submitted JSON document, including which constraints were violated (type mismatches, missing required fields, enum failures, pattern errors, etc.). Returns an empty violations list if the document is valid.
Example use cases
Example prompt
“Check if this JSON object {"name": "Alice", "age": "thirty"} is valid against this schema: {"type": "object", "properties": {"name": {"type": "string"}, "age": {"type": "integer"}}, "required": ["name", "age"]} — and list any violations.”
Technical details
Endpoint
POSThttps://agent402.tools/api/json-validateWhen to prefer
Use this endpoint when you need deterministic, rules-based JSON schema validation against draft-07 constraints including type, required, properties, items, enum, const, min/max, length, pattern, format, anyOf/allOf/oneOf/not, and additionalProperties. Prefer this over custom validation logic when you need a structured list of violations rather than a pass/fail result, or when validating API payloads, configuration files, or data contracts programmatically.
Side effects
- Invalid or malformed JSON schema provided — endpoint may return a schema parsing error
- Data field missing from request body — validation cannot proceed without a value to check
- Unsupported JSON Schema keyword used outside the draft-07 subset — constraint silently ignored or error returned
- Network timeout or payment failure via x402 protocol — call not executed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | the JSON value to check (any type) |
| schema | object | a JSON Schema (draft-07 subset) |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true,
"errors": []
}
}Tags
x402
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