404 responses in express
Sure! Here is an example of how you can handle 404 responses in Express, along with explanations for each step:
Install Express: First, make sure you have Express installed in your project by running the command
npm install express
.Require Express: In your JavaScript file, require Express by adding
const express = require('express');
.Create an Express app: Create an instance of the Express application by adding
const app = express();
.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 areq
,res
, andnext
parameter. Inside the function, call theres.status()
method and pass 404 as the argument. Then, call theres.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');
});
- 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.