Frequently Asked Questions

Answers to common questions about JSON Online.

1 Is my data safe?

Absolutely. JSON Online processes everything locally in your browser. No data is ever sent to a server. You can verify this by opening the Network tab in your browser's Developer Tools — you'll see zero outbound requests with your data.

2 Can I use this offline?

Yes! JSON Online is a Progressive Web App (PWA). Install it from the browser's address bar or the install button, and it works offline — perfect for development on the go.

3 What JSON size can it handle?

JSON Online can handle files up to several megabytes. Performance depends on your browser and device, but typical API responses and config files work instantly.

4 What does Auto-Fix repair?

Auto-Fix handles the most common mistakes: trailing commas, single quotes instead of double quotes, unquoted keys, JavaScript comments (// and /* */), BOM characters, and JS-only literals like undefined, NaN, and Infinity.

5 How does timestamp detection work?

In the Tree Viewer, numeric values that look like Unix timestamps (seconds or milliseconds) and ISO 8601 date strings are automatically shown with a human-readable date tooltip. No configuration needed.

6 Is it really free?

Yes, JSON Online is completely free with no hidden fees, no signup, and no ads. It's built for developers who just want a fast, clean JSON tool.