JSON Transformer

Paste JSON and reshape it with safe, built-in steps: jump to a path (e.g. data.items[0]), keep only selected keys on an object, or filter an array of objects by a field value. No scripts run on your data—this is not a full programming environment. For pretty-print only, use the JSON formatter.

Input JSON Clear

Or upload a JSON file

Max 10 MB UTF-8 · processed locally

1. Focus (optional) Path from root

Use dot segments and [index] for arrays. Invalid paths stop with a clear error.

2. Pick keys (optional) Keep only these top-level keys on the focused object

Keys (comma or newline)

3. Filter array (optional) Keep only array elements where a property equals a value (string match)

Property name

Value

Runs on the focused value after steps 1–2; it must be a JSON array of objects.

Output Indent

Result

JSON output

Runs only in your browser. No eval, no uploads.

HOW TO

How to transform JSON online

Chain a path, optional key pick, and optional array filter, then copy or download the result.

Paste or upload JSON

Stay under the size limit. Optionally set a path to focus on part of the tree.

Choose transforms

Pick keys on an object, filter an array by one field, or use path alone to extract a subtree.

Run and export

Copy or download JSON, or send the output back to the input for another pass.

FAQ

Frequently asked questions

Does this run JavaScript on my JSON?

No arbitrary code. The tool applies fixed operations: path navigation, key picking, and string-equality filtering on arrays. There is no eval or user-supplied expressions.

What is the size limit?

About 10 MB of UTF-8 text per paste or file. The JSON Validator allows a higher limit when your browser can parse in a worker. Very large documents may still hit memory limits.

How is this different from the JSON formatter?

The formatter focuses on pretty-print and minify. Here you change structure: extract a path, drop keys you do not need, or filter list entries.