404 responses in express

Sure! Here is an example of how you can handle 404 responses in Express, along with explanations for each step:

  1. Install Express: First, make sure you have Express installed in your project by running the command npm install express.

  2. Require Express: In your JavaScript file, require Express by adding const express = require('express');.

  3. Create an Express app: Create an instance of the Express application by adding const app = express();.

  4. Define a route for 404 responses: To handle 404 responses, use the app.use() method and pass a middleware function as an argument. The middleware function should have a req, res, and next parameter. Inside the function, call the res.status() method and pass 404 as the argument. Then, call the res.send() method and provide a message or HTML template to display when a 404 error occurs.

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

  1. Start the server: Add app.listen() to start the Express server and specify the port number to listen on. For example, app.listen(3000); will start the server on port 3000.

That's it! With these steps, you have set up a basic 404 response handling in Express. Remember to customize the message or HTML template inside the middleware function to suit your needs.