Free browser-based data tool

JSON Array Field Selector

Keep only the JSON fields you need.

Your files never leave your computer.All processing happens locally inside your browser.

Discover and select nested JSON paths
Preserve record order and valid JSON structure
Copy or download pretty or minified output

1

Upload JSON

Choose a .json file. It is read only by this browser tab.

Drop a JSON object array file here

or use the file browser

2

Paste and validate a JSON object array

UtilityDock detects selectable leaf paths without changing your source.

JSON array input

Paste JSON or upload a file to begin.

What JSON field selection is

Project object arrays into a focused structure

Field selection keeps chosen properties and removes everything else from each object. UtilityDock detects nested leaf paths, reconstructs their parent structure, and preserves source record order entirely in your browser.

Reducing API payloads

Keep the response fields your integration actually uses

Prototype a smaller API response by retaining identifiers, labels, statuses, or nested values while excluding verbose metadata. The projected JSON is ready to copy into fixtures or download for local development.

Preparing analytics datasets

Create a consistent input for analysis

Select dimensions and measures before sending records into a notebook, spreadsheet, or reporting workflow. Missing fields remain absent, explicit null values remain null, and every source row stays in place.

Removing unnecessary fields

Reduce noise before sharing or processing data

Drop internal flags, large descriptions, or unrelated nested structures by selecting only the paths needed downstream. Review the before-and-after byte size before downloading.

Examples

Select paths for a clear outcome

Goal	Fields to keep
Create a contact list	`id`, `profile.name`, `profile.email`
Prepare event metrics	`event.type`, `event.timestamp`, `value`
Simplify product records	`sku`, `name`, `pricing.amount`

Data Toolkit

Continue with related UtilityDock JSON workflows

JSON Array GrouperOrganize records by shared field values.JSON Array DeduplicatorRemove duplicate records before projection.JSON Array FilterKeep only records that match a rule.JSON Array SorterOrder records by a detected field.JSON FlattenerConvert nested values into portable paths.JSON UnflattenerReconstruct nested JSON from paths.JSON Formatter & ValidatorValidate and format any JSON document.JSON to CSVExport object arrays as spreadsheet rows.

FAQ

Questions about selecting JSON fields

Does UtilityDock upload or store my JSON?

No. Your files never leave your computer. Validation, field detection, projection, preview, copying, and download creation all happen locally inside your browser.

What JSON shape can I use?

Version 1 accepts a non-empty array of JSON objects at the document root.

Can I keep nested fields?

Yes. UtilityDock detects nested leaf values with escaped dot paths and indexed array paths, then reconstructs their containing objects and arrays.

What happens when a selected field is missing?

That field is omitted from the affected output object. Null values are retained because null is an explicit JSON value.

Does field selection change array order?

No. Source records stay in their original order, and selected nested arrays retain their indexes.

Can I rename or calculate fields?

No. Version 1 only retains selected fields. It does not rename fields, evaluate expressions, calculate values, or call APIs.