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JSON String Length Check
x402
JSON String 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 2026-10-15).
Validates selected string fields in a JSON object against caller-supplied minimum and maximum length bounds, returning counts and normalized validation findings.
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON String Length Check: JSON String Length Check checks selected string fields against caller length bounds from bounded caller-supplied values without an external provider. Call JSON String 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 String Length Check as versioned deterministic JSON. Price: $0…
Output
Returns a versioned deterministic JSON object with per-field validation findings, character counts, normalized values, and an overall pass/fail status indicating which fields satisfy the supplied minimum and maximum length bounds.
Example use cases
Pre-flight check before downstream API
“I'm about to send a batch plan to a third-party API that requires all string fields to be between 10 and 500 characters — can you validate the 'title', 'body', and 'tags' fields in this object first?”
Validate agent-generated form fields
“My agent just filled out a form object with 'first_name', 'bio', and 'tagline' — check that none of them are shorter than 2 characters or longer than 100 before I submit it.”
Enforce contract on structured output
“I need to make sure the 'headline' and 'description' fields in this JSON result are within the allowed range of 1 to 256 characters — can you run a length check and tell me which ones pass or fail?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-string-length-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs a deterministic, stateless preflight check on string field lengths in a JSON object before handing structured data to a downstream tool or API with strict character constraints. Prefer it over manual checks when you need versioned, auditable validation findings with normalized output rather than a simple boolean.
Side effects
- Field names listed in 'fields' not found in the provided object — those fields may be skipped or flagged as missing
- Minimum greater than maximum causes an invalid bounds error
- Object exceeds 128 properties limit — request rejected
- Fields array exceeds 256 items — request rejected
- Individual string values exceeding 8192 characters may be truncated or rejected
- Non-string field values may be ignored or cause type mismatch findings
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| fields | array | Fields supplied to JSON String Length Check; used only for this bounded calculation and processed in memory without retention. |
| object | object | Object supplied to JSON String Length Check; used only for this bounded calculation and processed in memory without retention. |
| maximum | integer | Maximum supplied to JSON String Length Check; used only for this bounded calculation and processed in memory without retention. |
| minimum | integer | Minimum supplied to JSON String 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-string-length-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "e61f8b4c6194a85d31be821c7ddcec01a240fe3d4b33cd76336131c6315185b6",
"external_calls": 0
},
"operation": "data_batch:json_string_length_check"
}
}Tags
x402
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