404 Page Implementation in Express.js — a practical guide to Express 404 page with clear examples you can reuse in real projects.
404 Page Implementation in Express.js — 36/55 in the Node.js series. Full playlist companion: Node.js complete course on YouTube. Prefer one article? Read the complete Node.js tutorial.
Short description
Place a final middleware after all routes. If nothing matched earlier, send a 404 response.
404 middleware
app.use((req, res) => {
res.status(404).send('<h1>404 - Page Not Found</h1>');
});