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var stacklogger = require("stacklogger")

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stacklogger v1.2.0

Colored JavaScript logging library that prepends the current class and function name to the message for ease of debugging.



Colored JavaScript logging library that prepends the caller's className.functionName to the message. This helps tremendously when having many console.logs during your debugging phase, as you can see which class and function this message originated from. It works best in the chrome dev tools:

stacklogger console output chrome

Firefox also works, but with their JS engine there is no way (I know of) to reliably get the class name, so the filename is used instead (which should be fine because you keep your code modularized anyway :wink:).

stacklogger console output firefox


The output above is produced by the following code.

Calling log directly

The library exports a log function that works exactly like console.log

import log from 'stacklogger'

class ExampleLog {
  constructor () {
    this.obj = {hello: 'world', anotherKey: [0, 1]}
    this.arr = [1, 3, 5, 7, 9]
  hello () {
    log('Logging some text with log()', this.obj, this.arr)

let e1 = new ExampleLog()

Hooking console.log

If you already wrote your application using console.log, you can simply call hookConsoleLog() once at the start of your application, and all console.log calls will be redirected to the stacklogger's log function.

import { hookConsoleLog } from 'stacklogger'
class ExampleConsoleLog {
  hello () {
    console.log('Called with console.log')
console.log('standard console.log without the hook')
console.log('console.log hooked now')
let e2 = new ExampleConsoleLog()


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