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how to kill a running node process

ps aux | grep node
kill -9 PROCESS_ID

kill node process

The Difference Between kill and pkill
The kill command is a wrapper to the kill system call, which knows only about process IDs. pkill can determine the process ID based on things like, process name, owner of the process or session id.

Syntax:
$ kill 1234
$ pkill -f node

kill node process

lsof -t -i:3000

6279

node js kill process

process.exit()

//or

if (condition){process.exit()}

//or

setTimeout((function() {
    return process.exit();
}), 5000);
// kill server after 5000ms

//source :
//https://stackabuse.com/how-to-exit-in-node-js/