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5. Getting started with Firebase Authentication

AngularFireAuth.user provides you an Observable<User|null> to monitor your application's authentication State.

AngularFireAuth.auth returns an initialized firebase.auth.Auth instance, allowing you to log users in, out, etc. See the Firebase docs for more information on what methods are available.

Example app:

import { Component } from '@angular/core';
import { AngularFireAuth } from '@angular/fire/auth';
import { auth } from 'firebase/app';

  selector: 'app-root',
  template: `
    <div *ngIf="afAuth.user | async as user; else showLogin">
      <h1>Hello {{ user.displayName }}!</h1>
      <button (click)="logout()">Logout</button>
    <ng-template #showLogin>
      <p>Please login.</p>
      <button (click)="login()">Login with Google</button>
export class AppComponent {
  constructor(public afAuth: AngularFireAuth) {
  login() {
    this.afAuth.auth.signInWithPopup(new auth.GoogleAuthProvider());
  logout() {


Learn how to setup Firebase Authentication with Cordova in the Firebase Guides.