How do I handle logging in asynchronous code?

How do I handle logging in asynchronous code?

You can use libraries like Winston or Pino for structured logging. Would you like an example?

Yes, please provide an example using Winston.

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: 'combined.log' })
  ]
});

async function fetchData() {
  logger.info('Fetching data...');
  // Simulate async operation
  const data = await someAsyncFunction();
  logger.info('Data fetched successfully', { data });
}

This logs messages before and after the async operation.

What if I want to log errors as well?

You can add an error transport to your logger. For example:

logger.add(new winston.transports.File({ filename: 'error.log', level: 'error' }));

Then, use logger.error('Error message') in your catch blocks.