Description: A route handler in Express.js is a function that handles requests to a specific route within a web application. This component is fundamental in the Express framework, as it allows developers to define how HTTP requests arriving at different endpoints of the application should be managed. Route handlers can receive parameters, process data, and return responses to the client, making them an essential part of the business logic of an application. Additionally, they can include middleware to perform additional tasks, such as authentication or data validation, before the main logic of the handler is executed. The flexibility of route handlers allows developers to create scalable and maintainable web applications by organizing code in a way that is easy to understand and modify. In summary, route handlers are the heart of request management in Express.js, facilitating efficient and structured interaction between the client and the server.
