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3.3.12 • Public • Published

npm version

NGX Logger

NGX Logger is a simple logging module for angular (currently supports angular 6.x and 7.x). It allows "pretty print" to the console, as well as allowing log messages to be POSTed to a URL for server-side logging.

Latest Updates to NGX Logger

  • Support of responseType for HTTP Requests. A new config option httpResponseType now allows you to set your server's response type.

  • Custom HTTP Params

    • If you need to pass in custom HTTP Params to your backend server, you can now use setCustomParams()
    this.logger.setCustomParams(new HttpParams());
  • Using the NGXLoggerMonitor and want to disable console logs? now you can!

    • new config option disableConsoleLogging will disable console logs, but still alert to the log monitor
  • Custom HTTP Headers

    • If you use an auth token, or need to pass in a custom header, now you can!
    this.logger.setCustomHttpHeaders(new HttpHeaders({'X-Custom-Header': '123456'}));
  • Custom Log Monitoring is now available
    • Only 1 monitor can be registered at a time, registering a new monitor overwrites the previous monitor
    • This should be registered as soon as possible so that it does not miss any logs.
import {NGXLoggerMonitor, NGXLogInterface} from 'ngx-logger';
export class MyLoggerMonitor implements NGXLoggerMonitor {
  onLog(log: NGXLogInterface) {
    console.log('myCustomLoggerMonitor', log);
import {NGXLogger} from 'ngx-logger';
import {MyLoggerMonitor} from './my-logger-monitor';
export class MyService {
  constructor(private logger: NGXLogger) {
    this.logger.registerMonitor(new MyLoggerMonitor())
  • Updating your config after importing the module has never been easier...
this.logger.updateConfig({ level: NgxLoggerLevel.DEBUG });
  • You can now create a standalone logger with it's own config!
export class MyService {
  private logger: NGXLogger;
  constructor(customLogger: CustomNGXLoggerService) {
    this.logger = customLogger.create({ level: NgxLoggerLevel.ERROR });


  • @angular/common
  • @angular/core


npm install --save ngx-logger

Once installed you need to import our main module:

import { LoggerModule, NgxLoggerLevel } from 'ngx-logger';

The only remaining part is to list the imported module in your application module, passing in a config to intialize the logger.

  declarations: [AppComponent, ...],
  imports: [LoggerModule.forRoot({serverLoggingUrl: '/api/logs', level: NgxLoggerLevel.DEBUG, serverLogLevel: NgxLoggerLevel.ERROR}), ...],
  bootstrap: [AppComponent]
export class AppModule {


To use the Logger, you will need import it locally, then call one of the logging functions

import { Component } from '@angular/core';
import { NGXLogger } from 'ngx-logger';
  selector: 'your-component',
  templateUrl: './your.component.html',
  styleUrls: ['your.component.scss']
export class YourComponent {
  constructor(private logger: NGXLogger) {
    this.logger.debug('Your log message goes here');
    this.logger.debug('Multiple', 'Argument', 'support');

Config Options

  • serverLogLevel {NgxLoggerLevel} - Only sends logs to the server for the level specified or higher (OFF disables the logger for the server)
  • serverLoggingUrl {string} - URL to POST logs
  • level {NgxLoggerLevel} - The app will only log message for that level or higher (OFF disables the logger for the client)
  • disableConsoleLogging {boolean} - disables the console logging, while still alerting the log monitor
  • httpResponseType {'arraybuffer' | 'blob' | 'text' | 'json'} - The response type of the HTTP Logging request.

Server Side Logging

If serverLogginUrl exists, NGX Logger will attempt to POST that log to the server.

Payload Example {level: 'DEBUG', message: 'Your log message goes here'}

Testing your App when using NGXLogger

If you inject the of the NGX Logger services into your application. you will need to provide it in your Testing Module. All services have mocked classes that can be used for testing

  • NGXLoggerHttpService: NGXLoggerHttpServiceMock
  • CustomNGXLoggerService: CustomNGXLoggerServiceMock
  • NGXLogger: NGXLoggerMock

To provide them in your Testing Module

       imports: [

Demo App

There is a demo application with examples of how to use ngx-logger. To run it perform the following

  • Clone the repo
  • Run npm ci or npm install
  • Build ngx-logger using ng build
  • Run ng serve demo to serve the app

A convenience script has been added to package.json that performs the above steps. Simpley run npm run demo to have the demo built and served.


All are welcome to contribute to NGX Logger. A couple quick notes to get started..

  • NGX Logger is built with angular-cli
  • To use npm link, you must link the /src (or /dist after it is built) directory not root.
  • When possible, try to follow patterns that have already been established in the library
  • Try to make your code as simple as possible
    • Even if the code could be made shorter, having code that is readable and easily understood is way more valuable
  • Have fun!


npm i ngx-logger

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