mac find out what is using port code example

Example 1: 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>

Example 2: stop port 3000 mac

sudo lsof -i :3000
kill -9 PID

Example 3: kill the port in mac

sudo lsof -i tcp:3000

Example 4: killing a port mac

kill -9 <PID>