How to handle a 404 error — how to process it?

Error 404 means that the requested resource was not found on the server. To handle it, you can:

• Show a user-friendly message indicating that the page or resource does not exist.
• Redirect to a 404 error page, where navigation options or search can be provided.
• Log such errors for analysis and fixing potential broken links.

For example, in a web application, you can set up a route handler that returns a 404 page when no match is found:

app.use((req, res) => {
  res.status(404).send('Page not found');
});

This improves user experience and helps maintain the quality of the site.