Find and kill port processes

Find processes

On unix systems:

lsof -i :{port}

Example:

lsof -i :3000

Example output:

COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
node     12345  you    21u  IPv6 ...    TCP *:3000 (LISTEN)

Kill processes

kill 12345 

Or force kill

kill -9 12345