@varnxy/logger

Simple logging utility for Node

Introduction

The log is using format like this [TIMESTAMP:MSG_TYPE:APP_NAME] MESSAGE

• TIMESTAMP

  timestamp format is HH:mm:ss.

• MSG_TYPE

  Type of log like INFO, WARN, ERROR and DEBUG.

• APP_NAME

  Application name is mean what application you want to inform with.

• MESSAGE

  Your log message.

API

• constructor Constructor is have argument for APP_NAME, but this is optional. The default is base on file call the instance.

• setDirectory When we set the log directory it will never show on the console.

Logger API

• info

• warn

• error

• debug

  Debug will show when using DEBUG environment.

Logger API is using sprintf from sprintf-js.

DEBUG Environment

To show all log.debug you must set DEBUG=true, but if you want partially debug your application you can set DEBUG environment to APP_NAME into separated with comma.

For Example:

• DEBUG=index.js
• DEBUG=callcenter_inbound,callcenter_outbound
• DEBUG=app.js,controller/home.js

Usage

• Using Console

const logger = require('@varnxy/logger')

let log = logger('my_app')
log.info('Some Information')
// Output: [2019:02:12:INFO:my_app] Some Information
log.info('The data is: %s', JSON.stringify({foo: 'bar'}))
// Output: [2019:02:12:INFO:my_app] The data is: {"foo": "bar"}
log.warn('Some Information')
// Output: [2019:02:13:WARN:my_app] Some Information
log.warn('Disk Usage: %d', myDisk)
// Output: [2019:02:13:WARN:my_app] Disk Usage: 1050624
log.error('Some Information')
// Output: [2019:02:14:ERROR:my_app] Some Information
log.error('Error Application: %s', err)
// Output: [2019:02:14:ERROR:my_app] Error: Error message

• Using Log Directory

const logger = require('@varnxy/logger')
logger.setDirectory('./logs')
let log = logger('my_app')
log.info('Some Information')
// Output:
// [2019:02:12:INFO:my_app] Some Information
log.warn('Some Information')
// Output:
// [2019:02:12:INFO:my_app] Some Information
// [2019:02:13:WARN:my_app] Some Information
log.error('Some Information')
// Output:
// [2019:02:12:INFO:my_app] Some Information
// [2019:02:13:WARN:my_app] Some Information
// [2019:02:14:ERROR:my_app] Some Information