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SiteCheck JSON Schema Validator
x402
SiteCheck JSON Schema Validator is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).
Validates any JSON value against a provided JSON Schema and returns detailed validation errors with paths and keywords
Price / call$0.001
Success—
StatusUnknown
How this service works
Validates JSON data against a JSON Schema (draft 2020-12): valid true or false, and up to 50 errors with the instance path, the keyword and the message. Schema and data are each limited to 200 KB. Remote $ref targets are not fetched. No network call.
Output
Returns a JSON object indicating the JSON Schema draft used, a boolean 'valid' flag, an array of error objects each containing the JSON path, the failing keyword, and a human-readable message, plus the validator source (@cfworker/json-schema), the timestamp of the check, and a total error count.
Example use cases
API payload validation before sending
“Before I send this JSON payload to our partner API, validate it against their schema — the data is {"orderId": "X99", "amount": "150"} and the schema says orderId must be an integer and amount must be a number. Tell me what's wrong.”
CI pipeline schema conformance check
“Check whether this config JSON {"version": 2, "enabled": "yes", "retries": 3} is valid against the schema that requires enabled to be a boolean and version to be a string — give me every error with its path.”
Debugging malformed API response
“I got back a JSON response from an external service and I'm not sure it matches our expected schema. Can you validate {"user": {"id": 42, "role": 99}} against the schema that requires role to be a string and flag any mismatches?”
Technical details
Endpoint
POSThttps://api.sitecheck-api.workers.dev/api/json-validate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need programmatic JSON Schema validation with detailed per-field error reporting including JSON paths and schema keywords. Ideal for agents that need to verify API payloads, config files, or data structures against a formal schema before processing or forwarding them. Prefer over manual inspection when the schema is complex or errors need to be surfaced to end users.
Side effects
- Missing 'data' field returns validation error or empty result
- Invalid or malformed JSON Schema object causes schema parsing error
- Deeply nested schemas may produce many error entries
- Draft version mismatch between schema and validator may produce unexpected results
- Non-object schema values may be rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | Any JSON value to validate |
| schema | object | A JSON Schema (object or boolean) |
Output
Schema · Response
{
"type": "json",
"example": {
"draft": "2020-12",
"valid": false,
"errors": [
{
"path": "#",
"keyword": "properties",
"message": "Property \"id\" does not match schema."
},
{
"path": "#/id",
"keyword": "type",
"message": "Instance type \"string\" is invalid. Expected \"integer\"."
}
],
"source": "@cfworker/json-schema",
"checkedAt": "2026-10-14T07:00:59.162Z",
"errorCount": 2
}
}Tags
x402
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