Скачать или смотреть Firebase Auth in React: Check User Login Status and Hide Login Button | onAuthStateChanged Firebase

Google Login In React Using Firebase || signInWithPopup || Step-By-Step Guide || React || Firebase
   • Google Login In React Using Firebase || si...  

Code : https://github.com/AkajithAk/ReactUiY...

Are you building a React app and wondering how to check if a user is logged in using Firebase? In this video, we’ll walk you through how to detect user authentication state in React using Firebase Authentication — a must-know for anyone building modern, secure web applications.

Whether you're using Google Sign-In with Firebase, signInWithPopup, or any other login method, it's crucial to know how to determine if a user is logged in or logged out. Without this, your UI may still show the login button even after successful authentication — leading to a confusing experience.

We’ll explain how Firebase provides an authentication state observer through the onAuthStateChanged listener, which helps you track user sign-in status in real time. This lets you dynamically update your interface based on whether a user is currently authenticated.

By the end of this video, you'll understand:

How Firebase Auth manages login state in React

What onAuthStateChanged does and how it works behind the scenes

Why using this listener is better than checking localStorage or tokens manually

How to conditionally show login or logout buttons based on user state

The difference between Firebase modular and namespaced SDKs

📌 Perfect for:

React developers using Firebase Authentication
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Those wanting to hide the login button after sign-in

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