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winstonjs / winston-daily-rotate-file

A transport for winston which logs to a rotating file each day.
MIT License
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winston-daily-rotate-file

NPM version

NPM

A transport for winston which logs to a rotating file. Logs can be rotated based on a date, size limit, and old logs can be removed based on count or elapsed days.

Starting with version 2.0.0, the transport has been refactored to leverage the file-stream-rotator module. Some of the options in the 1.x versions of the transport have changed. Please review the options below to identify any changes needed.

Compatibility

Please note that if you are using winston@2, you will need to use winston-daily-rotate-file@3. winston-daily-rotate-file@4 removed support for winston@2.

Starting with version 5.0.0 this module also emits an "error" event for all low level filesystem error cases. Make sure to listen for this event to prevent crashes in your application.

This library should work starting with Node.js 8.x, but tests are only executed for Node.js 14+. Use on your own risk in lower Node.js versions.

Install

npm install winston-daily-rotate-file

Options

The DailyRotateFile transport can rotate files by minute, hour, day, month, year or weekday. In addition to the options accepted by the logger, winston-daily-rotate-file also accepts the following options:

Usage

  var winston = require('winston');
  require('winston-daily-rotate-file');

  var transport = new winston.transports.DailyRotateFile({
    level: 'info',
    filename: 'application-%DATE%.log',
    datePattern: 'YYYY-MM-DD-HH',
    zippedArchive: true,
    maxSize: '20m',
    maxFiles: '14d'
  });

  transport.on('error', error => {
    // log or handle errors here
  });

  transport.on('rotate', (oldFilename, newFilename) => {
    // do something fun
  });

  var logger = winston.createLogger({
    transports: [
      transport
    ]
  });

  logger.info('Hello World!');

using multiple transports

  var winston = require('winston');
  require('winston-daily-rotate-file');

  var transport1 = new winston.transports.DailyRotateFile({
    filename: 'application-%DATE%.log',
    datePattern: 'YYYY-MM-DD-HH',
    zippedArchive: true,
    maxSize: '20m',
    maxFiles: '14d'
  });

  var transport2 = new winston.transports.DailyRotateFile({
    level: 'error',
    filename: 'application-error-%DATE%.log',
    datePattern: 'YYYY-MM-DD-HH',
    zippedArchive: true,
    maxSize: '20m',
    maxFiles: '14d'
  });

  transport1.on('error', error => {
    // log or handle errors here
  });

  transport2.on('error', error => {
    // log or handle errors here
  });

  transport1.on('rotate', function(oldFilename, newFilename) {
    // do something fun
  });

  transport2.on('rotate', function(oldFilename, newFilename) {
    // do something fun
  });

  var logger = winston.createLogger({
    level: 'info'
    transports: [
      transport1, // will be used on info level
      transport2  // will be used on error level
    ]
  });

  logger.info('Hello World!');
  logger.error('Hello Error!');

ES6

import  *  as  winston  from  'winston';
import  'winston-daily-rotate-file';

const transport = new winston.transports.DailyRotateFile({
  filename: 'application-%DATE%.log',
  datePattern: 'YYYY-MM-DD-HH',
  zippedArchive: true,
  maxSize: '20m',
  maxFiles: '14d'
});

transport.on('error', error => {
  // log or handle errors here
});

transport.on('rotate', (oldFilename, newFilename) => {
  // do something fun
});

const logger = winston.createLogger({
  transports: [
    transport
  ]
});

logger.info('Hello World!');

Typescript


import * as winston from 'winston';
import DailyRotateFile from 'winston-daily-rotate-file';

const transport: DailyRotateFile = new DailyRotateFile({
    filename: 'application-%DATE%.log',
    datePattern: 'YYYY-MM-DD-HH',
    zippedArchive: true,
    maxSize: '20m',
    maxFiles: '14d'
});

transport.on('error', error => {
    // log or handle errors here
});

transport.on('rotate', (oldFilename, newFilename) => {
    // do something fun
});

const logger = winston.createLogger({
    transports: [
        transport
    ]
});

logger.info('Hello World!');

This transport emits the following custom events:

LICENSE

MIT

AUTHOR: Charlie Robbins
MAINTAINER: Matt Berther