Keep Only Selected Fields Across Every JSON Record

How to Use This Tool

Project one object or an array of objects onto an explicit field allowlist. Keep selected JSON object keys locally across one object or an array, producing a smaller reviewable dataset. Processing stays in the browser.

The failure JSON Key Picker is designed to catch

An allowlist is safer than a denylist when the upstream payload can add new fields without notice. The boundary is the job stated in Keep Only Selected Fields Across Every JSON Record; JSON Key Picker is not intended to score or transform a different workflow.

The JSON Key Picker input contract

The fields used for this specific operation are Input text, Keys to keep. Keep the source values beside the JSON Key Picker result, because replacing the original would remove the evidence needed to reproduce or reverse the operation.

• For JSON Key Picker, Input text starts at [{"id":1,"name":"Ana","email":"[email protected]"}] in the worked case; replace that example with the matching source value.
• For JSON Key Picker, Keys to keep starts at id,name in the worked case; replace that example with the matching source value.

Worked result for JSON Key Picker

The executable case called Default browser-only example expects out: [ { "id": 1, "name": "Ana" } ]. Verify that observation before entering real material, and then change one JSON Key Picker field at a time so an unexpected direction or formatting change can be traced to a specific input.

Reading the JSON Key Picker output

No. The transform runs in browser JavaScript and the page does not call a processing API. Network extensions or a compromised device remain outside this page's control. Apply that answer only when Input text, Keys to keep describe the same scope and format as the worked operation. If the source uses different units, quoting, nesting, timing or account rules, a plausible-looking JSON Key Picker output is not sufficient validation.

Assumptions attached to JSON Key Picker

• JSON Key Picker assumes that the pasted input uses the syntax described by the selected standard or page guidance.
• JSON Key Picker assumes that the operation is intentionally narrow and does not infer private downstream schema rules.

If one of these JSON Key Picker assumptions is false, keep the result as a diagnostic rather than production or decision data, and choose an implementation that explicitly supports the missing rule.

Evidence maintained for JSON Key Picker

The recorded reference is IETF RFC 8259 — JSON. Reopen that source when the definition, format, fee or policy behind JSON Key Picker changes; private configuration and downstream acceptance still have to be checked in the user's own system.

Where JSON Key Picker runs

The named operation executes in browser JavaScript without an ecech calculation API. For JSON Key Picker, local execution reduces transmission but does not control browser extensions, device security or the destination where the result is pasted, so sensitive inputs still require the user's normal handling rules.