How can I redirect users to a 404.html page in a Node.js server?

General Discussions
3

Serve 404 for Undefined Routes :

const http = require('http');
const fs = require('fs');
const path = require('path');

const server = http.createServer((req, res) => {
  const validRoutes = ['/home', '/about'];

  if (validRoutes.indexOf(req.url) === -1) {
    // Send 404 response and serve 404.html if route doesn't exist
    fs.readFile(path.join(__dirname, '404.html'), (err, data) => {
      if (err) {
        res.writeHead(500, { 'Content-Type': 'text/plain' });
        res.end('500 Server Error');
      } else {
        res.writeHead(404, { 'Content-Type': 'text/html' });
        res.end(data);
      }
    });
  } else {
    // Serve your valid route content here
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('This is a valid route');
  }
});

server.listen(3000, () => {
  console.log('Server is running on http://localhost:3000');
});