Is it possible to get the number of participants in a meeting without logging in? Something in JS like:
If yes, how do I do it?
There is no such feature on meet.jit.si for privacy reasons. If you have your own deployment you can use: jitsi-meet/mod_muc_size.lua at master · jitsi/jitsi-meet · GitHub
You may want to try https://jaas.8x8.vc though. There are webhooks there which can help you achieve that.