NodeJS: A simple winston logger wrapper, which is the daily logging rotation (even hourly, minutely and secondly rotation) available.

Logger.js

/*
 * A logger module, which is a simple `winston`(v3) wrapper.
 * @version 1.0.1
 * lastUpdated: 2019-02-13
 *
 * # Usage:
 * ```js
 * const logCfg = {
 *   // Label name. It's up to you:
 *   "label": "server",
 *   // Logging level: 
 *   "level": "error",
 *   "filename": "./log/web-prod.log",
 *   // whether outputs logs on console or not:
 *   "useConsole": false,
 *   // max logfile size:
 *   "maxSize": "10m",
 *   // max logfile count to be remained:
 *   "maxFiles": 7, // The latest 7 files will be kept.
 *   // Date pattern. It uses `moment` date format: http://momentjs.com/docs/#/displaying/format/
 *   // NOTE: If you want to rotate logs hourly, set "YYYY-MM-DD-HH":
 *   "datePattern": "YYYY-MM-DD", 
 * };
 * const Logger = require("./Logger.js"); // "./Logger.js" is this js file.
 * const logger = Logger.getLogger(logCfg);
 * 
 * logger.info("Hello: %s", "Akira");
 * logger.warn("Age: %d", 99);
 * logger.debug("Item: %o", { aaa: 123 });
 * logger.error("Oops! %o", Error("OOPS!"));
 * ```
 */
const winston = require("winston");
const DailyRotateFile = require('winston-daily-rotate-file');
/**
 * Get a logger instance.
 *
 * @param label {String} - Defaults to "default"
 * @param level {String} - log level. Defaults to "info"
 *  LogLevels: { 
 *    error: 0, 
 *    warn: 1, 
 *    info: 2, 
 *    verbose: 3, 
 *    debug: 4, 
 *    silly: 5 
 *  }
 * @param filename {String} - log file path. Defaults to "./log/app.log"
 * @param useConsole {Boolean} - whether logs output to console or not. Defaults to false.
 * @param maxSize {Number} - max file size. Defaults to "10m" (10MB).
 * @param maxFiles {Number} - max files count to be kept. Defaults to 7.
 * @param datePattern {Boolean} - moment date form. Defaults to "YYYY-MM-DD".
 *    See: http://momentjs.com/docs/#/displaying/format/
 */
module.exports.getLogger = function(p) {
  // Set the setting:
  const label = (p && p.label) ? p.label : "default";
  const level = (p && p.level) ? p.level : "info";
  const filename = (p && p.filename) ? p.filename : "./log/app.log";
  const useConsole = (p && p.useConsole) ? p.useConsole : false; // whether uses Console transport or not
  const maxSize = (p && p.maxSize) ? p.maxSize : "10m"; // 10MB
  const maxFiles = (p && p.maxFiles) ? p.maxFiles : 7; // 7 files will be kept
  const datePattern = (p && p.datePattern) ? p.datePattern : "YYYY-MM-DD"; // moment date format: http://momentjs.com/docs/#/displaying/format/
  //
  // Create transports
  //
  const transports = [];
  // [DailyRotateFile] transport:
  transports.push(new DailyRotateFile({
    filename,
    level,
    zippedArchive: true,
    maxSize,
    maxFiles,
    datePattern,
  }));
  // // [File] transport:
  // transports.push(new winston.transports.File({
  //   filename,
  //   level,
  //   maxsize: maxSize,
  // }));
  // [Console] transport:
  if (useConsole && process.env.NODE_ENV !== "production") {
    transports.push(new winston.transports.Console({
      level,
    }));
  }
  //
  // Create my format
  //
  const myFormat = winston.format.printf(({ level, message, label, timestamp }) => {
    const logmsg = `${timestamp} [${label}] ${level.toUpperCase()}: ${message}`;
    if (!useConsole) return logmsg;
    return colorize(logmsg, level);
  });
  //
  // Create a logger instance
  //
  const logger = winston.createLogger({
    format: winston.format.combine(
      winston.format.splat(),
      winston.format.label({ label }),
      winston.format.timestamp(),
      myFormat
    ),
    transports,
  });
  return logger;
};

/* COLOR CODES */
const COLOR_CODES = {
  Reset: "\x1b[0m",
  Bright: "\x1b[1m",
  Dim: "\x1b[2m",
  Underscore: "\x1b[4m",
  Blink: "\x1b[5m",
  Reverse: "\x1b[7m",
  Hidden: "\x1b[8m",
  FgBlack: "\x1b[30m",
  FgRed: "\x1b[31m",
  FgGreen: "\x1b[32m",
  FgYellow: "\x1b[33m",
  FgBlue: "\x1b[34m",
  FgMagenta: "\x1b[35m",
  FgCyan: "\x1b[36m",
  FgWhite: "\x1b[37m",
  BgBlack: "\x1b[40m",
  BgRed: "\x1b[41m",
  BgGreen: "\x1b[42m",
  BgYellow: "\x1b[43m",
  BgBlue: "\x1b[44m",
  BgMagenta: "\x1b[45m",
  BgCyan: "\x1b[46m",
  BgWhite: "\x1b[47m",
};

function colorize(msg, level = "info") {
  level = level.toLowerCase();
  let colorCode = COLOR_CODES.FgGreen;
  if (level === "error") {
    colorCode = COLOR_CODES.FgRed;
  } else if (level === "warn") {
    colorCode = COLOR_CODES.FgYellow;
  } else if (level === "debug") {
    colorCode = COLOR_CODES.FgCyan;
  } else if (level === "info") {
    colorCode = COLOR_CODES.FgGreen;
  }
  return `${colorCode}${msg}${COLOR_CODES.Reset}`;
}