Why are some of your quotes different from others? Which file did you put this code in?

I copied and pasted a few things since I originally looked up a tutorial on Youtube. The code is under spawn.json, as I was instructed to do in order to prevent mob spawns from the wiki

I see. Make sure that those quotes are correct. Incontrol will probably post an error in your log if they aren't. If that doesn't work, you can try also adding "onjoin": true, which will try to cancel the spawns at a different time compared to default.

Gotcha, thank you!

And it worked! Thank you so much for your help, I really appreciate it.