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JSON Key Extractor

Extract every key from a JSON object, including nested ones.

JSON ToolsBrowser-only • PrivateFree

JSON Input

Keys (dot notation)

Output will appear here...

Privacy First: All processing happens locally in your browser. Your data never leaves your device and is never uploaded to any server.

About JSON Key Extractor

The JSON Key Extractor walks a JSON document and lists every key it finds, including keys buried inside nested objects and arrays. It's a fast way to map the fields of an unfamiliar payload, build documentation, or plan a data mapping. The extraction runs locally in your browser so private data is safe. Browse the structure visually with the JSON Viewer first, then query specific values with the JSONPath Tester.

How to Use

1Open JSON Key Extractor and paste or type your data into the input area.
2Adjust any available options to match the result you want.
3Your output is generated instantly — no button-clicking required for most tools.
4Use the Copy or Download button to save your result.

Common Use Cases

Debugging API responses while building web and mobile apps
Cleaning up minified or messy JSON from logs and network tabs
Preparing configuration files and fixtures for testing
Converting data between JSON and other formats for imports/exports

Frequently Asked Questions

Does it include keys from nested objects?

Yes. The extractor recurses through nested objects and arrays and returns the full set of keys, so you see every field name in the document, not just the top level.

Are duplicate keys shown once?

Keys that repeat across many objects in an array are collapsed into a unique list, which makes it easy to see the complete field set for a collection of records.

Is JSON Key Extractor free to use?

Yes. JSON Key Extractor is completely free with no sign-up, no subscription, and no usage limits. Every tool on CodeUtilityKit is free forever.

Is my data safe when I use JSON Key Extractor?

Absolutely. JSON Key Extractor runs entirely in your browser. Your input is processed locally with JavaScript and is never sent to, stored on, or logged by any server — so it is safe even for private or sensitive data.