Customizable Logging For Vue.js – vuejs-logger

Customizable Logging For Vue.js – vuejs-logger


codecov npm npm GitHub license

Provides customizable logging functionality for Vue.js. Compatible with Vue2.

Table of Contents




vuejs-logger is a tool that enables configurable logging for Vue applications. Features include :

  • Output restriction based on selected loglevel.
  • Automatically JSON.stringify() the (reactive) properties passed to the logger.
  • Configurable options to customize output for a log messages.
  • Colored console messages for $log.warning, $log.error and $log.fatal.
logLevels :  ['debug', 'info', 'warn', 'error', 'fatal']


This project uses node and npm.

$ npm install vuejs-logger --save-exact


Below you can find an example of how to use vuejs-logger :


Name Required Type Default Description
isEnabled false Boolean true Enables the vuejs-logger plugin, useful toggle for production/development.
logLevel false String 'debug' Choose between ['debug', 'info', 'warn', 'error', 'fatal']. Read production tips.
stringifyArguments false Boolean false If true, all input will go through JSON.stringify(). Useful when printing reactive properties.
showLogLevel false Boolean false If true, the loglevel will be shown.
showMethodName false Boolean false If true, the method name of the parent function will be shown in the console.
separator false String ' l ' The seperator between parts of the output ( see screenshot.
showConsoleColors false Boolean false If true, enables console.warn, console.fatal, console.error for corresponding loglevels.

Code example

import VueLogger from 'vuejs-logger';
const isProduction = process.env.NODE_ENV === 'production';
const options = {
    isEnabled: true,
    logLevel : isProduction ? 'error' : 'debug',
    stringifyArguments : false,
    showLogLevel : true,
    showMethodName : true,
    separator: '|',
    showConsoleColors: true

Vue.use(VueLogger, options);
new Vue({
    data() {
        return {
            a : 'a',
            b : 'b'
    created() {
        this.$log.debug('test', this.a, 123)
        this.$'test', this.b)

function externalFunction() {
   // log from external function
   Vue.$log.debug('log from function outside component.');


screen shot 2017-10-17 at 10 54 05

Production tips

The plugin can be disabled for production or a lower logLevel can be set to minimize output (as shown in usage ). If the logLevel is set to 'fatal' the plugin will ignore all calls with less important loglevels in the code.

    function foo() {
        // these statements will print nothing if the logLevel is set to 'fatal'. But they will compile just fine. 
        this.$log.debug('test', 'bar')
        this.$log.error('test', 'foo')
        // this statement will print if the logLevel is set to 'fatal'
        this.$log.fatal('test', 'bar', 123)




Feel free to dive in! Open an issue or submit PRs.

vuejs-logger follows the Contributor Covenant Code of Conduct.


MIT © Justin Kames

Github Repository

Tags: #VueJs