How can I implement error logging in my Express app using Morgan?

How can I implement error logging in my Express app using Morgan?

You can use Morgan as a middleware in your Express app to log HTTP requests. To log errors specifically, you can create a custom token and use it in your logging format.

Can you show me a code example of how to set that up?

Sure! First, install Morgan using npm: npm install morgan. Then, in your app, you can set it up like this:

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

const app = express();

// Setup Morgan to log errors
app.use(morgan('combined', {
  skip: (req, res) => res.statusCode < 400
}));

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

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

What does the 'combined' format log?

The 'combined' format logs detailed information including the remote address, request method, URL, HTTP version, response status, response time, and more.