Kantan-logger NPM

Kantan Logger

A simple but hopefully versitale logger. Kantan Logger creates a log directory. In that directory Kantan Logger creates a directory with the date (MM.DD.YY). Logs are then titled with a time stamp (HH.MM.SS.MMM) of when it was created.

Installing

Install via npm

npm i kantan-logger

or yarn

yarn add kantan-logger

Getting Started

// node/common.js style 
const kantan = require('kantan-logger')

Usage

kantan.log(obj1 [, obj2, ..., objN])

obj1 ... objN - A list of JavaScript objects to write to the log file. The string representations of each of these objects are appended together in the order listed and written.

To start a new instance of the logger or a new file to write:

kantan.create(obj1)

obj1 - Object with the optional properties; title, location and directory.

Options

Option	Default	Notes
title	''	Prepends the title to the log file name
location	''	Relative from the directory from which your main file was run
directory	'logs'	Name of the logs directory
logLevels	'success', 'verbose', 'info', 'warning', 'error'	Names of the log levels you require
logLevelWebhooks	{}	Object where property is the log level you want to make the webhook on, and the value is the URL of where to push
useTimeInTitle	true	Use time in the title of the log file
useDateDirectories	true	Separate log files in date directories
daysTillDelete	7	Number of days of logs to keep
prettyJSON	true	Prettify JSON
prettyText	true	Formatted text without string literals
echoToConsole	false	Echos logs to the console
useJSON	false	Outputs logs in JSON
showMemoryUsage	false	Shows memory usage

Example:

kantan.create({
    title: 'TK-3623',
    location: 'var/',
    directory: 'my_logs',
    logLevels: ['ichi', 'ni', 'san', 'shi', 'go'],
    logLevelWebhooks: {
      ichi: 'http://www.mysite.com/ichi-data-goes-here'
    },
    useTimeInTitle: false,
    useDateDirectories: true,
    daysTillDelete: 14
})

Use Case

For example: You have an app that is always listening for a post, and on each post we create a new log file.

// server related requires and setup
const express = require('express')
const kantan = require('kantan-logger')

const port = process.env.PORT || 3001
const app = express()

app.use(express.urlencoded({ extended: false }))
app.use(express.json())

// start listening on port
app.listen(port, () => {
  console.log(`port up on ${port}`)
})

// starts listening for POSTs
app.post('/', (req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/html' })
  res.end('Thanks')
  // call new instance of kantan for this post
  const logger = kantan.create({
    // tells the logger to create logfile beginning with req.body.ticketId
    title: req.body.ticketId,
    logLevels: ['ichi', 'ni', 'san', 'shi', 'go'],
    logLevelWebhooks: {
      ichi: 'http://localhost:3000/ichi-data-goes-here'
    }
  })

  // calling with log level
  logger.ichi({
    info: 'when pushing a webhook the first argument must be an object',
    moreInfo: 'it can contain any additional parameters you would like to post',
    andMoreInfo: 'the current log level and message will also be posted as *level* & *message*'
  }, 'log messages here', 'and another', ['arrays', 'and', 'objects', 'are', 'also', 'ok'])

  // more code here...
  logger.log('information logged here')
  // and so on...
})