Authentication with Facebook API is necessary to access certain features like user data, posts, etc. Facebook provides an OAuth 2.0 authentication protocol to authenticate users and obtain an access token. In order to use this protocol with React, we need to follow a few steps. Let's dive in.
Step 1: Create a Facebook App and Get App ID and App Secret
To use Facebook authentication with your React app, you first need to create a Facebook app on the Facebook Developer Portal. After creating the app, you can find your App ID and App Secret in the app's dashboard.
Step 2: Install the Facebook SDK and React Facebook Login package
To use the Facebook API with React, we need to install the Facebook SDK and the
react-facebook-login package using the npm package manager. Run the following command in your terminal:
npm install facebook-sdk react-facebook-login
Step 3: Initialize the Facebook SDK
In order to use the Facebook SDK, we need to initialize it with our App ID. We can do this by adding the following code to our React component:
In the above if you are using Typescript and the compiler complains that
window.FB does not exist, simply change this line to
(window as any).FB.
window.fbAsyncInit function, we initialize the Facebook SDK with our App ID and set the version to use. In the
useEffect hook, we load the Facebook SDK asynchronously and set the SDK to auto-log app events.
Step 4: Add Facebook Login Button
To allow users to authenticate with Facebook, we need to add a Facebook Login button to our React component. We can use the
react-facebook-login package to add this button. Add the following code to your component:
FacebookLogin component, we set the
appId to our App ID and specify the
fields we want to retrieve from the user's Facebook profile. We also provide a
scope requests access to the Facebook user's Ads data which is available if they have been running ads on the Facebook platform.
The callback function will receive the user's authentication token which can be added to subsequent requests to other Facebook API endpoints to authenticate and return data in the context of that user.
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