Boss bar exists
Whether a boss bar with this name has been made and not removed.
A Minecraft element (a check) in Scoreboards & teams. Needs the Basic plan or higher to go live; building and testing are free.
Example
When a player joins → If Boss bar exists event → Show boss bar: event.
Also called
bar exists, has bar, bar made
Works as a data pack?
No. This one needs the Elementium plugin on a Paper server.
What you give it
- Bar