how to properly close node-express server?

app.listen() returns http.Server. You should invoke close() on that instance and not on app instance.

Ex.

app.get(
    '/auth/github/callback',
    passport.authenticate('github', { failureRedirect: '/login' }),
    function(req, res) {
        res.redirect('/');

        setTimeout(function () {
            server.close();
            // ^^^^^^^^^^^
        }, 3000)
    }
);

var server = app.listen('http://localhost:5000/');

You can inspect sources: /node_modules/express/lib/application.js

In express v3 they removed this function.

You can still achieve the same by assigning the result of app.listen() function and apply close on it:

var server = app.listen(3000);
server.close((err) => {
  console.log('server closed')
  process.exit(err ? 1 : 0)
})

https://github.com/visionmedia/express/issues/1366

If any error occurs in your express app then you must have to close the server and you can do that like below-

var app = express();
var server = app.listen(process.env.PORT || 5000)

If any error occurs then our application will get a signal named SIGTERM. You can read more SIGTERM here - https://www.gnu.org/software/libc/manual/html_node/Termination-Signals.html

process.on('SIGTERM', () => {
  console.info('SIGTERM signal received.');
  console.log('Closing http server.');
  server.close((err) => {
    console.log('Http server closed.');
    process.exit(err ? 1 : 0);
  });
});

I have answered a variation of "how to terminate a HTTP server" many times on different node.js support channels. Unfortunately, I couldn't recommend any of the existing libraries because they are lacking in one or another way. I have since put together a package that (I believe) is handling all the cases expected of graceful express.js HTTP(S) server termination.

https://github.com/gajus/http-terminator

The main benefit of http-terminator is that:

it does not monkey-patch Node.js API
it immediately destroys all sockets without an attached HTTP request
it allows graceful timeout to sockets with ongoing HTTP requests
it properly handles HTTPS connections
it informs connections using keep-alive that server is shutting down by setting a connection: close header
it does not terminate the Node.js process

how to properly close node-express server?

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