mac terminal find process by port
sudo lsof -i tcp:3000
                                
                            mac terminal find process by port
sudo lsof -i tcp:3000
                                
                            kill all ports mac
lsof -n -i TCP:8080
COMMAND   PID   USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
node     54762   user   23u  IPv4 XXXXXXXXX      0t0  TCP 127.0.0.1:http-alt (LISTEN)
PID // is second field in the response . Then, kill that process:
kill -9 54762 // here put PID number found on the table 54762
                                
                            killing a port mac
sudo lsof -i :3000
                                
                            killing a port mac
kill -9 <PID>
                                
                            kill process on port 3000 mac
kill $(lsof -ti:3000,3001,8080)
                                
                            import js in html
<script type="text/javascript" src="yourfile.js"></script>
                                
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