How can I log requests to a file using Morgan in my Node.js app?

How can I log requests to a file using Morgan in my Node.js app?

You can log requests to a file using Morgan by setting up a file stream with the 'fs' module. Here's a basic example.

Can you show me the code for that?

Sure! First, install Morgan and fs if you haven't already. Then, use the following code:

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

const app = express();
const accessLogStream = fs.createWriteStream('access.log', { flags: 'a' });

app.use(morgan('combined', { stream: accessLogStream }));

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

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

This will log all requests to 'access.log'.

What log format does Morgan support?

Morgan supports several predefined formats like 'combined', 'common', 'dev', 'short', and 'tiny'. You can also create a custom format.

How do I create a custom log format?

You can create a custom format by passing a string to Morgan. For example:

app.use(morgan(':method :url :status :res[content-length] - :response-time ms'));

This will log the HTTP method, URL, status, content length, and response time.