JSON Key Extractor
Extract all the keys from a JSON structure.
The keys in the data
JSON data is built from key-value pairs, and seeing all the keys a structure uses is useful for understanding its shape. This extracts the keys from JSON, in your browser, so you can map out what fields a piece of data contains.
Paste your JSON to extract its keys.
Understanding an unfamiliar structure
Extracting the keys is a practical way to understand JSON you did not create — an API response, a configuration file, an export — where the first question is often simply what fields are in here. The keys are the names of the data fields, so listing them reveals the structure at a glance, which is far quicker than reading through the whole thing, especially when it is large or deeply nested. This helps when working with a new data source, documenting a structure, checking what fields are available to use, or comparing what two JSON structures contain. Developers meet unfamiliar JSON constantly, and getting a clear map of its keys is a natural first step to working with it. Doing this in the browser means even JSON containing sensitive data is analysed locally without being uploaded, so you can inspect the structure of private data while keeping it entirely on your own device.
JSON Key Extractor FAQ
Why extract the keys from JSON?
The keys name the data fields, so listing them reveals the structure at a glance — quicker than reading through large or deeply nested data to see what fields exist.
When is this useful?
Understanding an unfamiliar API response or config file, documenting a structure, or checking what fields are available to work with.
Is my data uploaded?
No. The extraction happens in your browser, so the data stays on your device.