How do I configure the Winston logger in my Node.js application?

How do I configure the Winston logger in my Node.js application?

To configure Winston, first install it using npm: 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.File({ filename: 'combined.log' })
  ]
});

logger.info('Logger is configured!');

Can I log messages to the console as well?

Yes, you can add a console transport to log messages to the console. Just modify the transports array like this:

transports: [
  new winston.transports.Console(),
  new winston.transports.File({ filename: 'error.log', level: 'error' }),
  new winston.transports.File({ filename: 'combined.log' })
]

How can I change the log level dynamically?

You can change the log level dynamically by using the logger.level property. For example:

logger.level = 'debug';
logger.debug('This is a debug message');