implement Gmail login using Next js

Implement Gmail login using Next js

In this article, we will guide you through the process of implement Gmail login using Next js, a popular React framework. Gmail login integration is a crucial aspect of modern web development, providing users with a seamless and secure authentication experience. By following our step-by-step instructions and utilizing the provided code examples, you’ll be able to enhance your web application’s authentication capabilities and deliver a user-friendly login experience.

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Step 1: Set up a Next.js project

• Create a new Next.js project by running the following command in your terminal:

Step 2: Install required packages

• Navigate to your project directory:

• Install the necessary packages:

Step 3: Create a Gmail login button component

• In the components folder of your project, create a new file called GmailLoginButton.js.
• Add the following code to the file:

import { google } from 'googleapis';

const oauth2Client = new google.auth.OAuth2(
  process.env.GOOGLE_CLIENT_ID,
  process.env.GOOGLE_CLIENT_SECRET,
  process.env.GOOGLE_REDIRECT_URI
);

const GmailLoginButton = () => {
  const handleLogin = () => {
    const authUrl = oauth2Client.generateAuthUrl({
      access_type: 'offline',
      scope: ['https://www.googleapis.com/auth/gmail.readonly']
    });

    window.location.href = authUrl;
  };

  return (
    <button onClick={handleLogin}>Login with Gmail</button>
  );
};

export default GmailLoginButton;

Step 4: Set up environment variables

• Create a .env.local file in your project root folder.
• Add the following environment variables to the file:

Note: Replace <your-google-client-id> and <your-google-client-secret> with your actual Google OAuth 2.0 client ID and client secret.

Step 5: Create an authentication callback page

• In the pages folder of your project, create a new file called auth/callback.js.
• Add the following code to the file:

import { google } from 'googleapis';

const oauth2Client = new google.auth.OAuth2(
  process.env.GOOGLE_CLIENT_ID,
  process.env.GOOGLE_CLIENT_SECRET,
  process.env.GOOGLE_REDIRECT_URI
);

const Callback = () => {
  const handleCallback = async (code) => {
    try {
      const { tokens } = await oauth2Client.getToken(code);
      // Use tokens to make API requests or store them for future use
      console.log(tokens);
    } catch (error) {
      console.error('Error retrieving access token:', error);
    }
  };

  // Retrieve authorization code from query parameters
  const code = new URLSearchParams(window.location.search).get('code');

  // Handle the callback once the component mounts
  useEffect(() => {
    if (code) {
      handleCallback(code);
    }
  }, []);

  return <div>Processing...</div>;
};

export default Callback;

Step 6: Update the home page

• Open the pages/index.js file in your project.
• Replace the existing code with the following:

import GmailLoginButton from '../components/GmailLoginButton';

const Home = () => {
  return (
    <div>
      <h1>Welcome to my Gmail Login App!</h1>
      <GmailLoginButton />
    </div>
  );
};

export default Home;