![](https://hackernoon.com/hn-images/1*D_fQvlZiD5r0BrjeczfLlg.png)

![](https://i.ytimg.com/vi/wvBGlHgCryg/hqdefault.jpg)

After many months of React Native development, I’ve been acquainted with building an [authentication workflow between Firebase and React Navigation](https://www.youtube.com/watch?v=0TlOhmdl3-M&list=PLkOyNuxGl9jzR1VoEcBritiKfG0Ejtt54&index=2&t=1328s). Lately I was looking to do the same but in ReactJS. The only difference between the web and the native use case is that, on a web app, the user can try to access a navigation state directly via the URL so you need to protect your components. Luckily, React 16.3 now provides [a fantastic new Context API](https://reactjs.org/blog/2018/03/29/react-v-16-3.html) that will help us with that.

We first create a Firebase auth context that contains two values:

*   `authStatusReported` indicates if Firebase has reported the auth status. If the auth status hasn’t been reported yet, you might want to display a loading indicator for your app.
*   `isUserSignedIn` indicates if the user is signed-in or not.

When the component is mounted, we listen to Firebase `onAuthStateChanged` in order to set the proper state to our context. Below is the source code of our context provider.

![](https://avatars3.githubusercontent.com/u/306134?s=400&v=4)

Now we need to create a `Protected` component (or higher-order component depending on your preferences) that will wrap a component into a consumer of the Firebase authentication context. If the user is signed-in, we return the children, if not, we redirect to the login page.

![](https://avatars3.githubusercontent.com/u/306134?s=400&v=4)

Of course, you need to wrap your root app component with `FirebaseAuthProvider`. Using React Context API This is the part that is specific to ReactJS as opposed to React Native.

Everything else is pretty much the same. You can create a Firebase module as below.

![](https://avatars3.githubusercontent.com/u/306134?s=400&v=4)

You can then sign-in:

![](https://avatars3.githubusercontent.com/u/306134?s=400&v=4)

and sign-up:

![](https://avatars3.githubusercontent.com/u/306134?s=400&v=4)

Pretty straightforward no? Will you be using the new React context API to implement your authentication workflow? I’m looking forward to read your thoughts on this topic.

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