logger.js

const { createLogger, format, transports } = require('winston');
const { combine, timestamp, printf, json, colorize } = format;

// Define custom log levels
const customLevels = {
  levels: {
    error: 0,
    warn: 1,
    info: 2,
    http: 3,
    verbose: 4,
    debug: 5,
    silly: 6
  },
  colors: {
    error: 'red',
    warn: 'yellow',
    info: 'green',
    http: 'magenta',
    verbose: 'cyan',
    debug: 'blue',
    silly: 'gray'
  }
};

// Define custom log format
const logFormat = printf(({ level, message, timestamp }) => {
  return `${timestamp} [${level}]: ${message}`;
});

// Create the logger
const logger = createLogger({
  levels: customLevels.levels,
  format: combine(
    timestamp(),
    logFormat
  ),
  transports: [
    new transports.Console({
      format: combine(
        colorize(),
        logFormat
      )
    }),
    new transports.File({ filename: 'app.log', format: json() })
  ]
});

// Add colors to the custom levels
require('winston').addColors(customLevels.colors);

module.exports = logger;