All Tools VerseJSON Flattener
Flatten nested JSON into a single level, using dot-notation keys for every nested value.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Processed locally in your browser. Your JSON never leaves this tab.
How to Use JSON Flattener
- Paste your JSON. Any nested object or array.
- Flatten. Nested keys are joined into single dot-notation keys.
- Read the result. A key like a.b.0 points to a deeply nested value.
- Copy the result. Click Copy result. It all runs in your browser.
Frequently Asked Questions
What does flattening do?
It turns a nested structure into a single-level object where each key is the full path, written in dot notation.
How are array items handled?
Array indexes become part of the key, so the first item of list c appears as c.0.
What about empty objects and arrays?
They are kept as empty values at their path, so no information is silently dropped.
Is my data sent anywhere?
No. The flattening runs entirely in your browser, so your JSON never leaves the tab.
Is it free?
Yes. Every tool here is free to use with no sign up.
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