How can I implement logging in a Node.js Express application?

How can I implement logging in a Node.js Express application?

You can use middleware like 'morgan' for logging HTTP requests in your Express app. Would you like a code example?

Yes, please provide a code example.

Sure! First, install morgan using npm: npm install morgan. Then, in your app, add this code:

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

const app = express();
app.use(morgan('combined')); // Logs requests in Apache combined format

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

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

What other logging libraries can I use?

Other popular logging libraries include 'winston' and 'bunyan'. They offer more features like log levels and transports.

How can I log errors in my application?

You can use middleware to catch errors and log them. For example:

app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).send('Something broke!');
});