logger.js

const { createLogger, format, transports } = require('winston');
const path = require('path');

const logLevel = process.env.LOG_LEVEL || 'info';
const logDirectory = path.join(__dirname, 'logs');

const logger = createLogger({
    level: logLevel,
    format: format.combine(
        format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
        format.errors({ stack: true }),
        format.splat(),
        format.json()
    ),
    defaultMeta: { service: 'my-service' },
    transports: [
        new transports.File({ filename: path.join(logDirectory, 'error.log'), level: 'error' }),
        new transports.File({ filename: path.join(logDirectory, 'combined.log') }),
    ],
});

if (process.env.NODE_ENV !== 'production') {
    logger.add(new transports.Console({
        format: format.combine(
            format.colorize(),
            format.simple()
        ),
    }));
}

module.exports = logger;