get-express-starter/templates/node-express-boilerplate/src/config/logger.js

Get production ready express boilerplate with a single command

const winston = require('winston');
const env = require('./env');

const enumerateErrorFormat = winston.format((info) => {
  if (info instanceof Error) {
    Object.assign(info, { message: info.stack });
  }
  return info;
});

const logger = winston.createLogger({
  level: env.mode === 'development' ? 'debug' : 'info',
  format: winston.format.combine(
    enumerateErrorFormat(),
    env.mode === 'development' ? winston.format.colorize() : winston.format.uncolorize(),
    winston.format.splat(),
    winston.format.printf(({ level, message }) => `${level}: ${message}`)
  ),
  transports: [
    new winston.transports.Console({
      stderrLevels: ['error'],
    }),
  ],
});

module.exports = logger;