Configuring Passport's Facebook Strategy

There are a few steps to configure the Passport's Facebook Strategy. We will discuss each step in detail:

1. Create and set up a Facebook app. This will provide us with an App ID and an App Secret.
2. Add a button to our login page that allows our users to log in via Facebook.
3. Add the necessary routes for Facebook authentication.
4. Add a middleware method to check whether authentication is successful.

Let's dive into the details for each of the preceding steps.

Creating and setting up a Facebook app

To be able to use the Facebook Strategy, you have to build a Facebook application first. The developers, portal for Facebook is at https://developers.facebook.com/.

After logging in, click on the Get Started button and then click on Next.

Then, you will see a drop-down menu in the top-right corner of the screen called My Apps, where you can find the option to create a new application.

Choose a display name that you want to name your application. In this case, we will name...