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JSON Lines Stringify
x402
JSON Lines Stringify is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).
Serializes an array of JSON objects into compact newline-delimited JSON Lines (JSONL) format with counts and a versioned result contract
Price / call$0.001
Success—
StatusUnknown
How this service works
JSON Lines Stringify: JSON Lines Stringify serializes bounded JSON values as compact newline-delimited JSON from bounded caller-supplied values without an external provider. Call JSON Lines Stringify 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 Lines Stringify as versioned deterministic JSON. Price: $0.001 USDC…
Output
Returns a versioned deterministic JSON result containing the JSONL-formatted string (each input object serialized on its own line), a count of lines produced, normalized values, and a versioned result contract identifier. No data is retained after processing.
Example use cases
Pipeline ingestion pre-processing
“I have a batch of up to 200 order records as JSON objects that I need to convert to JSON Lines format before sending them to our data pipeline — can you stringify them into JSONL?”
Agent handoff to strict contract tool
“Before passing this structured batch plan to the next tool, serialize it as newline-delimited JSON Lines so it meets the stricter input contract on the other end.”
Log export formatting
“I need to convert this array of log event objects into JSONL format — one compact JSON object per line — so the log ingestion service can process them correctly.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/json-lines-stringify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs a deterministic, bounded, stateless JSONL serialization with a versioned result contract and line-count metadata — particularly before handing structured data to a downstream tool that enforces a strict JSONL input contract. Prefer over ad-hoc client-side serialization when auditability, count verification, or a standardized result envelope matters.
Side effects
- Input array exceeds 256 items — request rejected with a bounds error
- Individual objects exceed 128 properties — validation error returned
- Malformed or non-serializable input values cause serialization failure
- Empty items array returns zero-line output with count of 0
- Network or payment processing failure returns 402 or 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| items | array | Items supplied to JSON Lines Stringify; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"text": "{\"id\":1}\n{\"id\":2}",
"line_count": 2
},
"schema": "delx/util-json-lines-stringify/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "0e0bc9cb6b5f1b41ed89071cc8222f2bbc6b2c97af66c03cd0d24ac5102d86af",
"external_calls": 0
},
"operation": "data_batch:json_lines_stringify"
}
}Tags
x402
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