Access tokens and refresh tokens are integral components of modern authentication mechanisms used in web applications and APIs. They play a crucial role in securely managing user authentication and authorization processes, ensuring that only authenticated users can access protected resources.
Express.js, also known as Express, stands as a minimalistic and flexible web application framework designed for Node.js. It provides a rich set of functionalities for constructing web applications and APIs. With Express, developers gain access to a powerful toolkit that facilitates the handling of HTTP requests and responses, middleware configuration for customizing server behavior, and routing for managing application endpoints.