Winston-lite-esque Log lib for terminal and browser debugging, with piles of unignorable log tags and marker styles.

Usage no npm install needed!

<script type="module">
  import madLogs from '';



  • Colourful, obtrusive, Typescript-friendly logs for the browser console and NodeJS.
    • Completely isomorphic
  • As with Winston, lets you alter the amount of text shown based on current log level:
    • Automatic handling of any of the following LOG_LEVEL environment variable values:
      • silly, verbose, debug, info, warn, error, wtf
  • Factory for file-specific logging: logFactory
  • Over 45 separate styles to keep log output different from file-to-file for easier debugging


npm install --save mad-logs


yarn add mad-logs

Usage (browser, commonJS)

Import the library

// my-fun-file.ts
import {logFactory, Styles} from 'mad-logs';

Build a logger with the log factory

const log = logFactory(`my-fun-file.tsx`, Styles.angryBird);

Do some mad, mad logging!

log.silly('display me on the browser console, but only if the log level is set to "silly"');

    'display me on the browser console, but only if the log level is "verbose" ' +
    'or higher (verbose or silly mode)'
    'display me on the browser console, but only if the log level is "info" ' +
    'or higher (info, verbose, or silly)'

    'display me on the browser console, but only if the log level is "warn" ' +
    'or higher (warn, info, verbose, or silly)'

    'display this on the browser console as an error message, but only if the ' +
    'log level is "error" or higher (error, warn, info, verbose, or silly)'
    'Also display this on the browser console, as an error message'

const result =
        'Log return value of myFunction(). Pass result thru & assign it to var "result"',
// result now contains the return value of myFunction()

Details (on above)

  • 'my-fun-file.js' is a placeholder for the name of the current file
    • This appears in each log line, as part of the "tag"
  • logMarkers.maceWindu << replace with any item in the log marker styles list (see below)
  • All log instance functions return the last value they were passed.
  • TODO let users make their own log markers

Available log "marker" styles

  • none
  • angryBird
  • aquarium
  • arrow
  • backAndForth
  • barbells
  • bracelet
  • brainwave
  • cantTouch
  • cartoonSwearing
  • checkmate
  • cult
  • dirtRoad
  • escherBarbieLego
  • farmerBrown
  • fountain
  • fresh
  • grasslands
  • hatBlock
  • hotPursuit
  • joy
  • kingRageBlock
  • lakeLouise
  • lucky
  • maceWindu
  • mechanicalAtFists
  • moProblems
  • mrsPotatoVHS
  • neverEnough
  • nightmare
  • pipeDream
  • ohMy
  • potOfGold
  • probeArcade
  • rainbowLeaf
  • rockIsDead
  • seafoamSalad
  • smokeyHatesChristmas
  • springy
  • swimmers
  • tangerines
  • theBird
  • theHeist
  • vendetta
  • xmlHell
  • zebra

Log marker usage

  • When first "constructing" the log factory, define the log marker as the second argument (as seen above)
    • if not given, it uses the logMarkers.none style

NodeJS-specific logging

  • Deprecated - please don't use it
    • This will be removed in an upcoming version of mad-logs
  • shared/root logging is now isomorphic, so it's no longer needed