JSON Structure Analyzer
Analyze any JSON document — value-type counts, nesting depth, unique keys and size.
About JSON Structure Analyzer
JSON Structure Analyzer profiles any JSON document — counting objects, arrays and value types, measuring nesting depth and unique keys, and reporting byte size — so you can understand an unfamiliar API payload at a glance.
How to use JSON Structure Analyzer
- 1Paste or type your data into the input box above (a sample is pre-filled so you can try it instantly).
- 2Adjust any options on offer — delimiter, columns, formatting and so on — to match what you need.
- 3Analysing happens instantly as you type; review the result in the output panel.
- 4Click Copy to grab the output or Download to save it as a file — JSON Structure Analyzer keeps everything on your device.
Why use JSON Structure Analyzer?
- ✓Sizing up an unfamiliar API response
- ✓Checking how deeply nested a payload is
- ✓Counting records and unique fields in a dataset
- ✓100% free with no sign-up, no watermark and no usage limits
- ✓Runs entirely in your browser — your data is never uploaded or stored
- ✓Works offline once loaded, with instant results and one-click copy or download
Frequently asked questions
What does it measure?+
Counts of objects, arrays, strings, numbers, booleans and nulls, the maximum nesting depth, the number of unique keys and the document's byte size.
Does it modify the JSON?+
No — it only reads and analyses the structure; nothing is changed or sent anywhere.
Is it free to use?+
Yes — it is completely free with no sign-up, no account and no usage limits. There is no watermark and no paywall, so you can process as many files as you like.
Is my data private and secure?+
Yes. This tool runs entirely in your browser using client-side JavaScript — your data is never uploaded to a server, stored or logged. Once the page has loaded you can even use it offline, which makes it safe for confidential or proprietary files.
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