Answers for "link a js filer"

kill all server 5000 mac

#First run this, to get port information (with the port you want to kill)
sudo lsof -i :3000 

#Then run this, with <PID> replaced by the value in the column returned by previous command.
kill -9 <PID>

stop port 3000 mac

sudo lsof -i :3000
kill -9 PID

mac terminal find process by port

sudo lsof -i tcp:3000

how to link your js file to html

<script src="index.js"></script>

how to link javascript to html

<script src = "index.js"></script>