I like to write little tmux scripts that help me boot up the dev-servers of whatever project I'm about to work on.
Just as I like to be able to start working on a project with a single command, I like to be able to stop working on it quickly, so I can switch over to something else.
I've bound Prefix + X to close all panes in a tmux session at once, basically killing the entire
tmux session.
To do the same, just add the following code to your .tmux.conf:
bind X confirm-before kill-session
You might need to kill any remaining processes even once your tmux session was killed, which is why I usually run
killall node right after. :)