How to stop the node.js inspector / Chrome Debugger on SIGINT?

Question

I have the following code to capture a ^C from the terminal and gracefully shutdown my Express app:

process.on('SIGINT', () => {
    console.log('SIGINT received ...');
    console.log('Shutting down the server');

    server.close(() => {
        console.log('Server has been shutdown');
        console.log('Exiting process ...');
        process.exit(0);
    });
});

However if I start my node instance with --inspect, then the above code fails to stop the inspector and the Chrome debugger. When I restart my application, I get the following error:

Starting inspector on 127.0.0.1:9229 failed: address already in use

How do I gracefully stop my app to avoid this error?

Full code available here.

Answer 1

It seems that VSCode, Puppeteer, nodemon, express, etc. causes this problem, you ran a process in the background or just closed the debugging area [browser, terminal, etc. ] or whatever , anyway, you can in CMD run

$ ps ax | grep node

then

$ killall -9 node

it is not the best solution, also, i may suggest that you look for the process using this port then send close signal

$ sudo ss -lptn 'sport = :9229'

OR

$ sudo netstat -nlp | grep :9229

OR

$ sudo lsof -n -i :9229 | grep LISTEN

THEN:

$ sudo kill <pid>

OR JUST [the two steps in one]

$ sudo kill `sudo lsof -t -i:9229`

OR

$ sudo kill $(sudo lsof -t -i:9229)

Answer 2

I had the same terminal error from nodemon, even though I thought I'd quit all terminal processes, but simply quitting VSCode and reopening solved for me (thanks to KhogaEslam's answer for the hint).

Hope this helps someone else too!

Answer 3

was at a node docker. with ss, complete, if u know the port is open:

kill `ss -lptn 'sport = :THE_PORT' | tail -n1 | cut -d, -f2 | cut -d= -f2`