express-insights/logger.js

Production-ready Express middleware for backend health monitoring with metrics, HTML/JSON output, authentication, and service checks.

const winston = require('winston');

function setupLogger({ level, destination, filePath }) {
  const transports = [];
  if (destination === 'console') {
    transports.push(new winston.transports.Console());
  } else if (destination === 'file') {
    transports.push(new winston.transports.File({ filename: filePath }));
  }

  return winston.createLogger({
    level,
    format: winston.format.combine(
      winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
      winston.format.json()
    ),
    transports,
  });
}

module.exports = { setupLogger };