stop port 3000 mac
sudo lsof -i :3000
kill -9 PID
mac terminal find process by port
sudo lsof -i tcp:3000
check all the ports in use mac
$ npx kill-port 3000 8080 8081
Process on port 3000 killed
Process on port 8080 killed
Process on port 8081 killed
import js in html
<script type="text/javascript" src="yourfile.js"></script>
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