Nice project! Congrats on the launch. Consider adding a loading spinner or a different kind of loading indicator as running queries that use external json take some time to load.

Also, I think you can explore a direction to advertise this project as an "SQL viewer for JSON api/files". So imagine I have a json file that I want to explore using SQL - this playground is a perfect fit for that.

Also a query history would be nice so that while I'm evolving my query I can always look back.