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JSON Drop-Null Transform
x402
JSON Drop-Null Transform is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-29).
Rewrites a JSON string by removing all null-valued keys, returning a compact null-free JSON object
Price / call$0.006
Success—
StatusUnknown
How this service works
Call when an agent needs JSON rewritten with the drop-null transform. No network. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/json-drop-null first.
Output
Returns the input JSON string rewritten with all null-valued keys removed, as a compact valid JSON object. No network calls are made; the transformation is purely local.
Example use cases
Clean API response before storage
“This API response has a bunch of null fields cluttering it up — can you strip all the nulls out of this JSON before we save it to the database? Here's the JSON: {"id":"abc123","score":42,"label":null,"metadata":null,"timestamp":"2024-01-15"}”
Sanitize JSON before third-party POST
“I need to send this JSON to a partner API that rejects null values — can you rewrite it with all the null keys removed? The JSON is: {"userId":"u9","plan":"pro","discount":null,"referral":null,"startDate":"2024-06-01"}”
Compact sparse config file
“My config JSON has a lot of optional fields that ended up null — can you drop all the null entries so I'm left with just the values that are actually set? Here it is: {"host":"localhost","port":8080,"proxy":null,"timeout":null,"debug":true}”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/json-drop-null?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a simple, reliable, paid-via-x402 null-stripping transform on a JSON string with no network dependencies. If a free sandbox endpoint at POST /v1/sandbox/json-drop-null is available, prefer that first. Use this paid endpoint when the sandbox is unavailable or rate-limited, or when operating in a production payment-capable agent pipeline.
Side effects
- Input text is not valid JSON — returns an error indicating malformed input
- Input exceeds 100,000 character limit — returns a validation error
- Empty string input — rejected by minLength:1 constraint
- Malformed request body missing the 'text' field — returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Input for this SKU. The route description says whether it is plain text, a URL, base64 bytes, or an already-encoded token. |
Tags
x402
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