This is an example Node.js application that demonstrates how to use GitHub's OAuth API to authenticate and fetch data about a user.

Before running this application, you'll need to create a GitHub OAuth App and obtain a client ID and secret. You can do this by following the instructions in the GitHub documentation.

1. Clone the repository:

   git clone https://github.com/your-username/your-repo.git

Go to the project directory:

cd your-repo Install the dependencies:

npm install Set the following environment variables:

CLIENT_SECRET: the client secret of your GitHub OAuth App. CLIENT_ID: the client ID of your GitHub OAuth App. REDIRECT_URI: the redirect URI of your GitHub OAuth App. SCOPE: the scopes that your GitHub OAuth App is requesting. Start the server:

npm start The server will start listening on http://localhost:3000.

The API provides the following endpoints:

• GET /: returns the URL to the GitHub OAuth authorize page.
• GET /redirect?code=<code>: exchanges the authorization code for an access token and sets a session cookie with the access token.
• GET /profile: returns the authenticated user's GitHub profile data.
• GET /followers: returns the authenticated user's GitHub followers.
• GET /repos: returns the authenticated user's GitHub repositories.

The server uses the GitHub OAuth API to authenticate users. The GET / endpoint returns the URL to the GitHub OAuth authorize page, where the user can authorize the application to access their GitHub data. After the user authorizes the application, they are redirected to the GET /redirect endpoint, which exchanges the authorization code for an access token and sets a session cookie with the access token.

The GET /profile, GET /followers, and GET /repos endpoints require the user to be authenticated. The server checks for the presence of the session cookie and uses the access token stored in the cookie to authenticate the user. If the user is not authenticated, the server returns an error with the message "Unauthorized".