@benchmate/logger

:page_with_curl: @benchmate/logger

logging library with support for structured logs (for cloud services) and local logging with colors

Installation

First install the library:

yarn add @benchmate/logger

Usage

ES6 imports

Create a new log.js file, as follows:

import createLogger from '@benchmate/logger'

const makeLogger = service => createLogger('APPNAME', service)

export default makeLogger

Finally, use the logger:

import makeLogger from './log'
const { debug, info, warn, error, crit, exception } = makeLogger('SERVICENAME')

debug('Debug or trace information.')
info('Routine information, such as ongoing status or performance.')
warn('Warning events might cause problems.')
error('Error events are likely to cause problems.')
exception(new Error('something went wrong!'))
crit('Critical events cause more severe problems or outages.')
exception(new Error('fatal error'), 'crit')

node.js

Create a new log.js file, as follows:

const createLogger = require('@benchmate/logger')

module.exports = service => createLogger('APPNAME', service)

Finally, use the logger:

const { debug, info, warn, error, crit, exception } = require('./log')('SERVICENAME')

debug('Debug or trace information.')
info('Routine information, such as ongoing status or performance.')
warn('Warning events might cause problems.')
error('Error events are likely to cause problems.')
exception(new Error('something went wrong!'))
crit('Critical events cause more severe problems or outages.')
exception(new Error('fatal error'), 'crit')

Log levels

We use a subset of the official syslog log levels:

• crit: Critical events cause more severe problems or outages.
• error: Error events are likely to cause problems.
• warn: Warning events might cause problems.
• info: Routine information, such as ongoing status or performance.
• debug: Debug or trace information.

Configuration

The logging library is configured using the following environment variables:

• LOG_LEVEL (default: info) - everything higher than this level is logged
• LOG_DISABLE_JSON (default: false) - disable structured JSON logs in production
• NODE_ENV (default: development) - set to production to enable structured JSON logs or simpler logs (without colors)

Demo

Run yarn demo to see a demo of the logger: