How can I implement logging middleware in Express.js?

How can I implement logging middleware in Express.js?

You can create a logging middleware function that logs requests and responses. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

const express = require('express');
const app = express();

const logger = (req, res, next) => {
    console.log(`${req.method} ${req.url}`);
    next();
};

app.use(logger);

app.get('/', (req, res) => {
    res.send('Hello World!');
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

This middleware logs the HTTP method and URL of each request.

How can I customize the logging format?

You can customize the logging format by modifying the console.log statement in the logger function. For example, you can include timestamps or response status codes.