Build Firebase Login with Facebook in Angular 12

Step: 1 – Setup Angular App for Creating Login with Facebook

ng new angularfirebaseproject

Your basic project will be set up after that enter into the project folder by using the following command.

cd angularfirebaseproject

You can follow this detailed article to set up the Angular project with external dependencies like Bootstrap4, FontAwesome, SASS, and NgBootstrap.

Step: 2 – Setup AngularFire2 Library

Now setup Firebase (AngularFire2 library) in your Angular project.

npm install firebase @angular/fire --save

Once you are done setting up this library, make the connection between your Firebase account and your Angular app.

Go to src/environments/enviorment.ts and enviorment.prod.ts files in your project’s enviornments folder. Then add your firebase configuration details in both the environment files as given below.

Step: 3 – Enable Facebook Auth Provider Service

Go to your Firebase account and click on Authenticate button on the sidebar navigation menu then click in front of the Facebook link.

Enter your App ID name and App secret then click on the save button. This method will activate your Facebook auth provider service from Firebase.

Step: 4 – Create Auth Service and Sign in component

Create auth.service.ts core file which will hold our main logic.

ng generate service auth

Create Sign in the template

ng generate component signin

Step: 5 – Create Firebase Facebook Login Auth Provider Service

Go to your auth.service.ts template.

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

@Injectable({
  providedIn: 'root'
})

export class AuthService {

  constructor(
    public afAuth: AngularFireAuth, // Inject Firebase auth service
  ) { }

  // Sign in with Facebook
  FacebookAuth() {
    return this.AuthLogin(new auth.FacebookAuthProvider());
  }  

  // Auth logic to run auth providers
  AuthLogin(provider) {
    return this.afAuth.auth.signInWithPopup(provider)
    .then((result) => {
        console.log('You have been successfully logged in!')
    }).catch((error) => {
        console.log(error)
    })
  }

}

Go to your signin.component.html template.

import { Component, OnInit } from '@angular/core';
import { AuthService } from "../../shared/services/auth.service";

@Component({
  selector: 'app-sign-in',
  templateUrl: './sign-in.component.html',
  styleUrls: ['./sign-in.component.css']
})

export class SignInComponent implements OnInit {

  constructor(public authService: AuthService) { }

  ngOnInit() { }

}

Step: 6 – Implement Login with Facebook in Angular

Integrate Firebase Facebook login auth provider in signin.component.html template.

<!-- Calling FacebookAuth Api from AuthService -->
<div class="formGroup">
   <button type="button" (click)="authService.FacebookAuth()">
      Log in with Facebook
   </button>
</div>

Read more: Build Full Angular Firebase Authentication System.