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

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

You can use middleware for error handling in Express.js. For logging, consider using libraries like Winston or Morgan.

Can you show me a basic example of using Winston for logging?

Sure! First, install Winston with npm install winston. Then, you can set it up like this:

const winston = require('winston');

const logger = winston.createLogger({
  level: 'info',
  format: winston.format.json(),
  transports: [
    new winston.transports.File({ filename: 'error.log', level: 'error' }),
    new winston.transports.Console()
  ],
});

logger.info('This is an info message');
logger.error('This is an error message');

What about handling errors in my routes?

You can create a custom error-handling middleware. Here's a simple example:

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