How can I implement error handling and logging in my application?

How can I implement error handling and logging in my application?

You can use libraries like Morgan for logging HTTP requests and handle errors using middleware in Express.

What are some best practices for logging errors?

Best practices include logging at different levels (info, warn, error), including timestamps, and avoiding sensitive data.

Can you show me a code example?

Sure! Here's a simple example using Express and Morgan:

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

const app = express();

app.use(morgan('combined'));

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

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

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

What if I want to log to a file instead of the console?

You can use the fs module to write logs to a file. Libraries like winston can also help with file logging.