JSON Formatter & Validator
Paste it in, get the answer instantly — nothing leaves your browser.
🔒 Everything is processed by your own browser. What you paste is never uploaded, stored, or sent anywhere.
How it works
- Paste into the box above, or drop a file onto it.
- Press the button — everything runs immediately, on your device.
- Copy the result, or download it as a file.
Frequently asked questions
Is what I paste sent to a server?
No. Everything is processed inside your browser using JavaScript on your own device. What you paste never leaves your computer, and nothing is stored or logged.
Does it cost anything, or need an account?
No. There is no signup, no account, no usage limit, and no payment.
How much can I paste in?
Up to 5 MB. Because the work happens on your own device, very large input is limited by your available memory rather than by a server.
Does it work offline?
Yes. Once the page has loaded, no connection is needed to convert.