@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
andDEBUG
. -
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