how to kill listening port in linux code example

Example 1: kill port

kill -9 $(sudo lsof -t -i:8080)

Example 2: stop a process running on a port

# Print PID of process bound on that port.
fuser 8080/tcp

# Kill that process
fuser -k 8080/tcp

Example 3: kill process on port

# To list any process listening to the port 8080:
lsof -i:8080

# To kill any process listening to the port 8080:
kill $(lsof -t -i:8080)

# or more violently:
kill -9 $(lsof -t -i:8080)
# (-9 corresponds to the SIGKILL - terminate immediately/hard kill signal: see List of Kill Signals and What is the purpose of the -9 option in the kill command?. If no signal is specified to kill, the TERM signal a.k.a. -15 or soft kill is sent, which sometimes isn't enough to kill a process.).

Example 4: kill process on port

lsof -i:3000           // Change 3000 to whatever your port is!
sudo kill 9 <PID>      // Change <PID> to the Pid number the above command returns