log4js.config.json

{
    appenders: {
      access: {
        type: 'dateFile',
        filename: 'log/access.log',
        pattern: '-yyyy-MM-dd',
        category: 'http',
      },
      app: {
        type: 'file',
        filename: 'log/app.log',
        layout: {
          type: 'pattern',
          pattern: '[%d] %p %c (%f{2}:%l) %m%n',
        },
        maxLogSize: 10485760,
        numBackups: 3,
      },
      stdout: {
        type: 'stdout',
        layout: {
          type: 'pattern',
          pattern: '%[ [%d] %p %c (%f{2}:%l) %m%n %]',
        },
      },
      errorFile: {
        type: 'file',
        filename: 'log/errors.log',
      },
      errors: {
        type: 'logLevelFilter',
        level: 'ERROR',
        appender: 'errorFile',
        layout: {
          type: 'pattern',
          pattern: '[%d] %p %c (%f:%l) %m%n',
        },
      },
    },
    categories: {
      default: {
        appenders: ['app', 'stdout', 'errors'],
        level: 'DEBUG',
        enableCallStack: true,
      },
      http: { appenders: ['access'], level: 'DEBUG' },
    },
  }