Hello Trinadh, thank you so much for your feedback! The project itself is open-source, also the production version (jsoncrack.com) is also hosted publicly using GitHub Pages. You can see everything transparent, the network requests and what's going on with your data at the repository's "gh-pages" branch. Unless you generate a share link and share it somewhere your data is not kept anywhere, if you were to accidentally share your data just send me a mail and I will remove it asap.
I love this tool, thank you for bringing it up! One feature that might be potentially useful (and I think relatively easy to add) is the export to SVG. I see that the result is in SVG format already but I don't see any "Export" button. If it's already implemented, please make it more obvious. Probably the right bottom corner with icons is the best place to put it. And again, it's a great tool, very helpful for many people I believe!
Loved the idea. But one concern, do we have an extension for VS code, or maybe in the future?
It would be hard to open another editor just to view JSON.