About JSON Unflatten
JSON Unflatten is a free, fast and reliable online tool. Expand dot-notation keys back into nested JSON. Try it with "{ a.b.c :1, d :2}". Everything runs locally in your browser — no files are uploaded and no data is stored, keeping your information completely private. It works responsively on both desktop and mobile devices.
How to use JSON Unflatten
- 1 Paste or type your content in the input box
- 2 Try the sample "{ a.b.c :1, d :2}" to see how it works
- 3 The result updates automatically in real time
- 4 Click "Copy" to copy the output
Frequently asked questions
What can I do with JSON Unflatten?
Expand dot-notation keys back into nested JSON. Try it with "{ a.b.c :1, d :2}".
Is JSON Unflatten free to use?
Yes — JSON Unflatten is a free online tool. No sign-up or login is required, and there are no hidden charges or usage limits.
Do I need to create an account to use JSON Unflatten?
No. JSON Unflatten runs entirely online in your browser — there is no account to create, no login, and nothing to install.
Does JSON Unflatten upload my data?
No. Everything runs locally in your browser. Your input never leaves your device, is never stored, and is never tracked, so it stays private.
Free, online, and private
Free to use
JSON Unflatten is completely free. There is no account to create, no login, and no hidden charge or usage limit.
Runs online in your browser
It is a free online tool that runs entirely in your browser. Nothing to download or install — open the page and start using it right away.
Your data stays private
All processing happens locally on your device. Your input is never uploaded, stored, or tracked, so it never leaves your browser.