Building a movie ticket booking frontend with React and connecting to a PostgreSQL database via Node.js involves creating a three-tier architecture: a React client for the user interface, a Node.js/Express backend for business logic and API endpoints, and a PostgreSQL database for persistent storage.
On the frontend, you will structure your React application around key components that handle the booking flow. A movie listing component displays available films with posters, titles, and showtimes. A seat selection component renders an interactive seating chart, allowing users to choose seats visually and see real-time availability. A booking summary component collects user details and confirms the reservation. You will manage state using React hooks or a state management library like Redux or Zustand, especially for tracking selected seats, user authentication status, and booking progress. React Router handles navigation between pages such as the home screen, movie details, seat selection, and confirmation.
The Node.js backend serves as the API layer. You will use Express to define RESTful endpoints that the React frontend calls. Key routes include GET endpoints for fetching movies and showtimes, POST endpoints for creating bookings and user registrations, and PUT or DELETE endpoints for updating or canceling reservations. Middleware handles authentication, typically using JSON Web Tokens to secure routes that require a logged-in user. The backend validates incoming requests, enforces business rules like seat availability and booking limits, and communicates with the PostgreSQL database.
Your PostgreSQL schema will include tables for movies, showtimes, theaters, seats, bookings, and users. The movies table stores film metadata. The showtimes table links movies to specific theaters and times. The seats table defines the seating layout for each theater, and the bookings table records which seats are reserved for which showtime, linking to the user who made the booking. You will use foreign keys to maintain referential integrity and indexes on frequently queried columns like showtime IDs and user IDs to optimize performance.
Connection between Node.js and PostgreSQL is established using a library like pg or an ORM such as Sequelize or Knex. The pg library provides a low-level client for executing SQL queries, while an ORM abstracts database operations into JavaScript objects and methods. You will configure a connection pool to manage multiple concurrent database connections efficiently, ensuring that your API can handle many simultaneous booking requests without exhausting resources.
The booking flow begins when a user selects a movie and showtime in the React app, triggering a request to the backend for available seats. The backend queries the database for seats not yet booked for that showtime and returns the data. When the user selects seats and submits the booking, the frontend sends a POST request with the selected seat IDs, showtime ID, and user information. The backend wraps the booking operation in a database transaction to ensure atomicity: it checks seat availability again, inserts the booking record, and updates seat status. If any step fails, the transaction rolls back to prevent partial bookings. On success, the backend returns a confirmation, and the React app displays a success message or ticket details.
Authentication and authorization are critical. You will implement user registration and login endpoints that hash passwords using bcrypt before storing them in the database. Upon successful login, the backend issues a JWT that the React app stores in local storage or a secure cookie. Subsequent API requests include this token in the Authorization header, and the backend middleware verifies it before allowing access to protected routes like booking creation or viewing past bookings.
Real-time seat availability can be enhanced by polling the backend periodically or using WebSockets to push updates when other users book seats. This prevents race conditions where two users attempt to book the same seat simultaneously. Optimistic locking or database-level constraints on unique seat-showtime combinations further safeguard data integrity.
Deployment involves hosting the React build on a static server or CDN, running the Node.js backend on a platform like Heroku, AWS, or DigitalOcean, and provisioning a PostgreSQL instance either as a managed service or self-hosted. Environment variables store sensitive configuration like database credentials and JWT secrets, keeping them out of source control.
This architecture separates concerns cleanly: React handles presentation and user interaction, Node.js manages API logic and validation, and PostgreSQL ensures reliable data persistence. The result is a scalable, maintainable system capable of handling the complexities of seat reservations, user management, and transactional integrity in a movie ticket booking application.