Log4js Transport

Log4js-node is a conversion of the Log4j framework to Node.js.

Transport Source

Important Notes

• Log4js only works in Node.js environments (not in browsers)
• By default, logging is disabled and must be configured via level or advanced configuration
• Consider using Winston as an alternative if Log4js configuration is too complex

Installation

Install the required packages:

npm

npm i loglayer @loglayer/transport-log4js log4js

pnpm

pnpm add loglayer @loglayer/transport-log4js log4js

yarn

yarn add loglayer @loglayer/transport-log4js log4js

Setup

import log4js from 'log4js'
import { LogLayer } from 'loglayer'
import { Log4JsTransport } from "@loglayer/transport-log4js"

const logger = log4js.getLogger()

// Enable logging output
logger.level = "trace"

const log = new LogLayer({
  transport: new Log4JsTransport({
    logger
  })
})

Log Level Mapping

LogLayer	Log4js
trace	trace
debug	debug
info	info
warn	warn
error	error
fatal	fatal