Basic Express server

logger.js

const { Logger, transports: { Console } } = require('winston');

module.exports = new ]Logger({
  transports: [
    new Console({
      colorize: true,
      level: process.env.NODE_ENV === 'development' ? 'silly' : 'info'
    })
  ]
});

server.js

const chalk = require('chalk'),
      express = require('express'),
      morgan = require('morgan'),
      logger = require('./logger'),
      app = express(),
      { env: { PORT, NODE_ENV } } = process,
      server = app.listen(PORT || 3000, function () {
        const { address, port } = server.address();

        logger.info(`Server start at ${chalk.cyan(`${address}:${port})}`);
      });

switch (NODE_ENV) {
  case 'development':
    logger.info('Running server in development mode');
    app.use(morgan('dev'));
    break;
  default:
    app.use(morgan('common'));
    break;
}