How do I set up Winston for logging in my Express.js application?

How do I set up Winston for logging in my Express.js application?

To set up Winston in your Express.js app, first install it using npm: npm install winston. Then, create a logger instance.

Can you show me a basic example of how to configure the logger?

Sure! Here's a simple configuration:

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()
  ]
});

This will log errors to a file and info logs to the console.

How can I log messages in different parts of my application?

You can use the logger instance to log messages anywhere in your app. For example:

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