How to authenticate with google using firebase in React ?

The following approach covers how to authenticate with Google using firebase in react. We have used firebase module to achieve so.

Creating React Application And Installing Module:

Step 1: Create a React myapp using the following command:

npx create-react-app myapp

Step 2: After creating your project folder i.e. myapp, move to it using the following command:

cd myapp

Project structure: Our project structure will look like this.

Step 3: After creating the ReactJS application, Install the firebase module using the following command:

npm install firebase@8.3.1 --save

Step 4: Go to your firebase dashboard and create a new project and copy your credentials.

const firebaseConfig = {
      apiKey: "your api key",
      authDomain: "your credentials",
      projectId: "your credentials",
      storageBucket: "your credentials",
      messagingSenderId: "your credentials",
      appId: "your credentials"
};

Step 5: Initialize the Firebase into your project by creating Firebase.js file with the following code.

Firebase.js

import firebase from 'firebase';

const firebaseConfig = {
    // Your credentials
};

firebase.initializeApp(firebaseConfig);
var auth = firebase.auth();
var provider = new firebase.auth.GoogleAuthProvider();
export {auth , provider};

Step 6: Go to your firebase dashboard and Enable the google sign-in method as shown below.

Step 7: Now install the npm package i.e. react-firebase-hooks using the following command.

npm i react-firebase-hooks

This package helps us to listen to the current state of the user.

Step 8: Create two files i.e. login.js and main.js with the following code.

login.js

import React from 'react';
import {auth , provider}  from './firebase.js';

const Login = () => {

    // Sign in with google
    const signin = () => {
        auth.signInWithPopup(provider).catch(alert);
    }

    return (
        <div>
            <center>
                <button style={{"marginTop" : "200px"}}
                onClick={signin}>Sign In with Google</button>
            </center>
        </div>
    );
}

export default Login;

Main.js

import React from 'react';
import {auth} from './firebase';

const Mainpage = () => {

    // Signout function
    const logout = () => {
        auth.signOut();
    }

    return (
        <div>
            Welcome

            {
                auth.currentUser.email
            }
            <button style={{"marginLeft" : "20px"}}
            onClick={logout}>
                Logout
            </button>
        </div>
    );
}

export default Mainpage;

Step 8: Finally Import all required files in App.js file as shown below.

App.js

Javascript

import React from 'react';
import {auth} from './firebase';
import {useAuthState} from 'react-firebase-hooks/auth';
import Login from './login';
import Mainpage from './main';

function App() {
  const [user] = useAuthState(auth);
  return (
    user ? <Mainpage/> : <Login/>
  );
}

export default App;

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output: Now open your browser and go to http://localhost:3000/, you will see the following output: