stop port 3000 mac
sudo lsof -i :3000
kill -9 PID
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
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