log4js-node/examples/log-to-files.js

const log4js = require('../lib/log4js');

log4js.configure(
  {
    appenders: {
      file: {
        type: 'file',
        filename: 'important-things.log',
        maxLogSize: 10 * 1024 * 1024, // = 10Mb
        numBackups: 5, // keep five backup files
        compress: true, // compress the backups
        encoding: 'utf-8',
        mode: 0o0640,
        flags: 'w+'
      },
      dateFile: {
        type: 'dateFile',
        filename: 'more-important-things.log',
        pattern: 'yyyy-MM-dd-hh',
        compress: true
      },
      out: {
        type: 'stdout'
      }
    },
    categories: {
      default: { appenders: ['file', 'dateFile', 'out'], level: 'trace' }
    }
  }
);

const logger = log4js.getLogger('things');
logger.debug('This little thing went to market');
logger.info('This little thing stayed at home');
logger.error('This little thing had roast beef');
logger.fatal('This little thing had none');
logger.trace('and this little thing went wee, wee, wee, all the way home.');