The main objective of this article is: Implementing Facebook Authentication Install Facebook Authentication NuGet Package: Let's install the required package for Facebook authentication. Visual Studio 2022: Install-Package Microsoft.AspNetCore.Authentication.Facebook -Version 7.0.4 Visual Studio Code: Install-Package Microsoft.AspNetCore.Authentication.Facebook -Version 7.0.4 Register Our App With Facebook: To enable Facebook authentication we have to register our API project with Facebook. So following are Facebook registration steps. (Step 1) Go to the Facebook developer page 'https://developers.facebook.com/apps/'. (Step 2) Go to the 'My Apps' menu and click on the 'Create App' button. (Step 3) In the 'Create An App' section, choose the 'Consumer' option and finally click on the 'Next' button. (Step 4) Enter a name for the 'Add an app name' and click on 'Create app'. (Step 5) On 'Add products to your app