This is a simple Express application that uses GitHub OAuth 2.0 for authentication via Passport.js. It allows users to log in with their GitHub account, view a personalized profile page, and log out.

• GitHub OAuth 2.0 authentication with Passport.js
• Session-based authentication to keep users logged in
• Displays a personalized greeting on the profile page
• Simple login and logout functionality

To run this project, you'll need:

• Node.js (version 12 or higher)
• A GitHub OAuth application (to obtain the Client ID and Client Secret)
• A .env file to securely manage sensitive information

1. Go to GitHub Developer Settings.
2. Click on New OAuth App.
3. Configure the application:
   • Application Name: Choose any name.
   • Homepage URL: http://localhost:3000
   • Authorization Callback URL: http://localhost:3000/auth/github/callback
4. Register the application.
5. Note your Client ID and Client Secret – you’ll need them in the .env file.

git clone https://github.com/sahil352005/Github-OAuth2.0.git
cd Github-OAuth2.0

Run the following command to install the necessary dependencies:

npm install

Create a .env file in the root directory of the project and add your GitHub OAuth credentials:

GITHUB_CLIENT_ID=your-client-id
GITHUB_CLIENT_SECRET=your-client-secret

Start the server with the following command:

npm start

The server should now be running at http://localhost:3000.

• / - Home page with a "Login with GitHub" link.
• /auth/github - Initiates GitHub authentication.
• /auth/github/callback - Callback URL after GitHub authentication.
• /profile - Displays the user’s GitHub username (only accessible when logged in).
• /logout - Logs the user out and redirects to the home page.

1. When you navigate to the home page, click the "Login with GitHub" link.
2. GitHub will ask for your permission to share your profile information.
3. After granting permission, you’ll be redirected to the /profile page, where you’ll see a welcome message with your GitHub username.
4. Use the /logout route to end the session and return to the home page.

• Ensure that the GitHub Client ID and Client Secret in the .env file are correct.
• Confirm that http://localhost:3000/auth/github/callback is added as an authorized callback URL in your GitHub Developer Settings.
• If you encounter an issue with req.logout(), ensure you’re using a version of Passport compatible with the session handling method used.

This project is open-source and available under the MIT License.

This README provides all necessary information to understand, set up, and run GitHub OAuth authentication in this application.