JSON Formatter
Pretty-print and validate JSON with instant feedback.
About JSON Formatter
JSON Formatter lets you format, validate and beautify JSON — free, and without creating an account. Pretty-print and validate JSON with instant feedback.
JSON Formatter runs entirely in your browser. Nothing you enter is sent to a server, so your text stays on your device. It is instant and works offline once the page has loaded.
Because it is web-based, JSON Formatter works on any operating system — Windows, macOS, Linux, Android, and iOS — straight from your browser, with nothing to install.
Comment ça marche
Open the tool
Load JSON Formatter in your browser — no signup or download needed.
Enter your input
Type or paste your text into the field.
Get the result instantly
The output updates as you go, computed entirely on your device.
Copy or save it
Copy the result to your clipboard or download it — nothing is sent to a server.
Frequently asked questions
Is JSON Formatter free?
Yes. JSON Formatter is completely free to use, with no signup and no limits on how many times you can use it.
Is my data sent anywhere?
No. JSON Formatter runs entirely in your browser. Your text is never transmitted to a server.
Do I need to install anything?
No installation is required. JSON Formatter runs in any modern web browser on desktop or mobile.
Est-ce privé ?
Oui. JSON Formatter fonctionne entièrement dans votre navigateur grâce à la puissance de votre appareil. Vos fichiers ne sont jamais envoyés à un serveur, donc rien ne quitte votre ordinateur.