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JSON Array Length Check
x402
JSON Array Length Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-16).
Validates that specified array fields within a JSON object have lengths within caller-supplied minimum and maximum bounds, returning counts and normalized values.
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Array Length Check: JSON Array Length Check checks selected array fields against caller item-count bounds from bounded caller-supplied values without an external provider. Call JSON Array Length Check before an agent hands structured data or a batch plan to a downstream tool with a stricter contract. Returns the bounded transformation or validation finding with counts, normalized values, and a versioned result contract for JSON Array Length Check as versioned deterministic JSON. Price: $0.…
Output
Returns a versioned deterministic JSON object containing: per-field array length counts, a pass/fail validation finding indicating whether each field is within the specified minimum and maximum bounds, normalized values, and a versioned result contract identifier.
Example use cases
Pre-flight batch size guard
“Before I send this job plan to the fulfillment API, check that the 'orders' array in this object has between 1 and 100 entries so we don't blow past the downstream limit.”
Agent output completeness validation
“My agent just returned a result with a 'recommendations' field — can you verify that array has at least 3 items and no more than 20 before we forward it to the user?”
Schema contract enforcement for structured pipeline
“Check the 'recipients' and 'attachments' array fields in this JSON object to make sure each has a minimum of 1 and a maximum of 10 items — reject it if either is out of bounds.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-array-length-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to enforce item-count contracts on array fields in a JSON object before passing structured data to a downstream tool or API with stricter requirements. It is ideal for pre-flight checks in agentic pipelines where batch sizes, list lengths, or array cardinality must be bounded. Prefer this over ad-hoc code execution when you need a deterministic, versioned, auditable validation result without retaining data.
Side effects
- Field names in 'fields' array do not exist in the provided object — returns counts of 0 or field-not-found findings
- Provided 'minimum' exceeds 'maximum' — may return an error or vacuous failure
- Non-array field specified — returns a type mismatch or zero-count finding
- Object exceeds 128 properties limit — request rejected
- Fields array exceeds 256 items — request rejected
- Missing required 'object' or 'fields' input — returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| fields | array | Fields supplied to JSON Array Length Check; used only for this bounded calculation and processed in memory without retention. |
| object | object | Object supplied to JSON Array Length Check; used only for this bounded calculation and processed in memory without retention. |
| maximum | integer | Maximum supplied to JSON Array Length Check; used only for this bounded calculation and processed in memory without retention. |
| minimum | integer | Minimum supplied to JSON Array Length Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"passed": true,
"invalid_fields": []
},
"schema": "delx/util-json-array-length-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "95a21205d9c6d659623a8ea762303c79e2d75f8c4ff1455041af6261652db58d",
"external_calls": 0
},
"operation": "data_batch:json_array_length_check"
}
}Tags
x402
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