Graceful shutdown handling in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Express library.

Express

const express = require([1]);

Drag options to blanks, or click blank then click option'

A"http"

B"express"

C"fs"

D"path"

Attempts:

3 left

💡 Hint

Common Mistakes

Using other module names like "http" or "fs" instead of "express".

The Express library is imported using require("express") to create an app.

2fill in blank

medium

Complete the code to start the server listening on port 3000.

Express

const server = app.listen([1], () => {
  console.log('Server running');
});

Drag options to blanks, or click blank then click option'

A8080

B5000

C3000

D80

Attempts:

3 left

💡 Hint

Common Mistakes

Using ports like 80 or 5000 which are valid but not the example's port.

Port 3000 is commonly used for local Express servers.

3fill in blank

hard

Fix the error in the shutdown handler to close the server properly.

Express

process.on('SIGINT', () => {
  console.log('Shutting down...');
  server.[1](() => {
    console.log('Server closed');
    process.exit(0);
  });
});

Drag options to blanks, or click blank then click option'

Aclose

Bstop

Cshutdown

Dend

Attempts:

3 left

💡 Hint

Common Mistakes

Using stop() or shutdown() instead of close().

The Express server instance has a close() method to stop accepting new connections.

4fill in blank

hard

Fill both blanks to handle server shutdown on SIGTERM signal.

Express

process.on('[1]', () => {
  console.log('SIGTERM received');
  server.[2](() => {
    console.log('Server closed on SIGTERM');
    process.exit(0);
  });
});

Drag options to blanks, or click blank then click option'

ASIGTERM

BSIGINT

Cclose

Dstop

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing SIGINT with SIGTERM.

Using stop() instead of close().

SIGTERM is a termination signal. The server closes with close() method.

5fill in blank

hard

Fill all three blanks to log shutdown reason and close the server.

Express

function gracefulShutdown(signal) {
  console.log(`Received $[1] signal.`);
  server.[2](() => {
    console.log(`Server closed due to $[3]`);
    process.exit(0);
  });
}

process.on('SIGINT', () => gracefulShutdown('SIGINT'));
process.on('SIGTERM', () => gracefulShutdown('SIGTERM'));

Drag options to blanks, or click blank then click option'

ASIGINT

Bclose

Csignal

DSIGQUIT

Attempts:

3 left

💡 Hint

Common Mistakes

Using SIGQUIT which is not handled here.

Using stop() instead of close().

Using a fixed string instead of the variable signal.

The function logs the signal name, closes the server with close(), and logs the signal reason.