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This application provides a streamlined way to integrate X (Twitter) authentication into web applications using the Next.js framework. It allows users to log in using their X accounts, retrieve their profile information, and manage their authentication state securely. To use the app, developers can simply deploy it to their hosting environment, configure the necessary environment variables for X authentication, and follow the setup instructions provided in the application. Users can initiate the login process by clicking a "Login with X" button, which opens a popup for authentication. Upon successful login, the app retrieves user data and displays a welcome message, including the user's name, username, and profile image. The application is built using TypeScript and React, leveraging Next.js for server-side rendering and API routes. It utilizes libraries such as clsx for conditional class names and tailwind-merge for merging Tailwind CSS classes. The app also employs the JOSE library for JSON Web Token (JWT) handling, ensuring secure user sessions. Key features of the app include: - A clean and minimalistic login interface that opens X's authentication popup. - Secure user authentication using OAuth 2.0 with Proof Key for Code Exchange (PKCE) to enhance security. - Retrieval of user profile information, including verification status, and proper display of verified badges. - Robust error handling with specific messages for various authentication scenarios. - Secure session management through HTTP-only cookies, preventing client-side access to tokens. - Responsive design and animations for a better user experience. Overall, this application serves as a comprehensive solution for developers looking to implement X authentication in their web applications efficiently and securely.