Everything you need to know about JSON Web Tools
Yes! JSON Web Tools is completely free to use with no hidden costs, subscriptions, or premium features. All 26+ tools are available to everyone at no charge. We believe developer tools should be accessible to all.
Absolutely safe! All JSON processing happens entirely in your browser using JavaScript. Your data never leaves your device and is never sent to our servers. We don't see, store, or have any access to your JSON data. The only storage used is your browser's localStorage for auto-save feature (stored locally on your device).
Yes! After your first visit, JSON Web Tools works completely offline. We use Progressive Web App (PWA) technology with a service worker to cache all necessary files. You can even install it as an app on your phone or computer and use it without an internet connection.
We offer 26+ tools including: Validator, Formatter, Minifier, Repair, Diff, Tree Viewer, JSONPath Query, Schema Validator, JWT Decoder, Escape/Unescape, Sort Keys, Flatten/Unflatten, Base64 Encode/Decode, URL Encode/Decode, Search, Merge, Mock Data Generator, and converters to CSV, YAML, XML, SQL, Excel, Java, Python, plus JSON Stringify and Pretty Print.
Yes! You can upload JSON files by clicking the upload button or dragging and dropping files directly into the editor. You can also fetch JSON from any public URL by pasting the URL and clicking "Fetch". All file processing happens in your browser for security.
Use the "Share" button to generate a shareable link. Your JSON is encoded directly into the URL, so when someone clicks the link, they'll see your JSON pre-loaded in the validator. No server storage involved - the JSON is in the URL itself.
• Ctrl+Enter (Cmd+Enter on Mac) - Validate/Execute current tool
• Ctrl+K - Clear current tool
• Ctrl+B - Prettify JSON
• Ctrl+S - Share JSON
Yes! Your work is automatically saved to your browser's localStorage as you type. If you accidentally close the tab or refresh the page, your work will be restored when you return (within 24 hours). This happens entirely on your device - nothing is sent to a server.
The Mock Data Generator creates realistic random JSON data for testing. Choose from templates (User, Product, Order, Blog Post) and specify how many records you want. Perfect for testing APIs, databases, or UI components without manually creating test data.
Yes, but performance depends on your browser and device. Since processing happens client-side, very large files (>10MB) may be slower. For best results with large files, use a modern browser like Chrome, Firefox, or Edge on a computer rather than mobile.
No! JSON Web Tools requires no registration, login, or account creation. Just visit the site and start using any tool immediately. No email required, no personal information collected.
JSON Web Tools works on all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience and PWA features, use the latest version of your browser. Mobile browsers are fully supported too!
On Chrome/Edge: Click the install icon in the address bar. On iOS Safari: Tap Share → Add to Home Screen. On Android: Tap the menu → Install app. Once installed, it works like a native app with offline support!
Yes! Contact us at admin@jsonwebtools.com with bug reports, feature requests, or feedback. We're actively developing and love hearing from users about what would make the tools more useful.
Currently, all tools are web-based. We're exploring adding a public API for developers in the future. Stay tuned for updates!
Also useful: JSON Formatter | JSON Validator | JWT Decoder | JSON Diff Tool | JSON Tutorials