Facebook is one of the most popular social media networks on the planet. So it stands to reason that many people would want to use Facebook sign-in for their Ionic 5 app. Firebase provides a variety of authentication options, but this post will focus on how to use Firebase to log in with Facebook login in an Ionic 5 application.

How to set up a project in Ionic 5 with Facebook login

The first thing you need to do is set up your Firebase account and project in Ionic 5. To do this, head over to Firebase by clicking here and logging in with either your Google or Facebook credentials if you don't have an account yet. Once logged into Firebase, click "Add Project" at the top right corner of the screen then enter a name for your project. Firebase will then prompt you to enable Firebase services which are necessary for social login. Once your project is created, click "Add Firebase to your Web App" on the Overview page of your new project.

The code for the login process

Next, copy the code snippet that Firebase provides and paste it into a blank .html file in an Ionic application with Facebook Login enabled (I'm using this example). Replace all instances of ***YOUR FB APP ID*** with your app's Facebook ID as shown below:

var config = { apiKey : 'AIzaSyDVdGltZXIrWGM-nfHTBqwXNbyuLARiWeebUvQ' , authDomain : '*************. Firebase authentication options *. social sign-in with Ionic Facebook login in your app Login

Why you should use Firebase instead of other authentication methods

* Firebase is an incredibly powerful platform for mobile apps, and it's even more powerful when combined with the Firebase Authentication Features.

* After setting up a Firebase project, set up Firebase Auth by following these steps:

* Firebase Authentication Options

* social sign-in with Ionic Facebook login in your app Login

* Firebase is an incredibly powerful platform for mobile apps, and it's even more powerful when combined with the Firebase Authentication Features. After setting up a Firebase project, set up Firebase Auth by following these steps:

Log into or create an account on firebaserc

*. Click **Authentication > SIGN-IN METHOD > Email/Password ******* Firebase is a suite of Firebase tools that can be used to build real-time backends for your apps. The Firebase platform includes services like Analytics, Authentication, Cloud Firestore and more.

* Firebase provides an entire backend service with social login integration baked right in the package! This means you don't have to spend time integrating Facebook or Google authentication into your own custom server. Because it's all done by Firebase, this will save you valuable development time when building out features on top of Ionic framework components that require user authentication. * Setting up social sign-in using FireBase takes less than five minutes if you already have a project set up in Ionic Framework! You'll need three things:

- Firebase Account

- Firebase AppID and Firebase Auth Secret from Facebook or Google Developer Console

- A social login provider like Facebook. * The code for the FireBase Login process looks something like this: // Get access token with just client id/secret using "Facebook" FirebaseAuthProvider.authWithOAuthPopup("FACEBOOK", clientId, clientSecret).then( function (response) { console .log('accessToken', response); }, function (error) { console .log('error' + error); } ); **NOTE: If you are not logged into Facebook on your device, FireBase will prompt you to do so before continuing! You may also use a custom UI by passing in an object with FirebaseAuth.authWithOAuthPopupOptions(). ** * FireBase Authentication Options

- Email/Password authentication

Facebook login

- Google login * Why should I use Firebase to login instead of other authentication methods? Firebase Auth is a full backend service that provides social sign in with just the Firebase SDK's and doesn't require you to build your own server!

This means less code for error prone real time operations, as well as more features out of the box. And if you want customizations - Firebase has an extensive API so it can be tweaked depending on what works best for your app. There are also many third party libraries available now which simplify the process even further: like AngularFire (for using Firebase Auth in Firebase with Angular). * A couple of things to keep in mind when using FireBase Authentication

- FireBase authentication does not work for iOS devices. For Facebook Login on Android, FirebaseAuthProvider can be used but if you want Facebook login on both platforms, consider looking into the next method which is more compatible across multiple device types (iOS included)

- There are some limitations like no support for Safari private mode since it would require server side implementation where Firebase Auth doesn't have access to your users session information. * Resources and links mentioned throughout the article: - Firebase Website

- Official Documentation for social signin methods using Firebase SDK's **NOTE All directions provided above were copied from Firebase's official documentation. Firebase is a trademark of Firebase, Inc. Facebook and Google are trademarks of their respective owners. Ionic Framework is an open-source SDK for hybrid mobile app development created by Drifty Co., the company behind it’s commercial counterpart – Ionic Pro! **.

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