Description: Debugging in Express is the process of identifying and correcting issues in applications built with the Express.js framework, which is one of the most popular tools for developing web applications in Node.js. This process is crucial to ensure that applications run efficiently and error-free. Debugging involves using various techniques and tools that allow developers to trace errors, analyze data flow, and understand application behavior in real-time. Key features of debugging in Express include the ability to log detailed information about requests and responses, as well as the capability to handle errors effectively. The relevance of debugging lies in its fundamental role in the software development cycle, where early identification of issues can save time and resources, as well as improve the end-user experience. In various production environments, a well-debugged application is not only more reliable but can also deliver superior performance, which is essential in a world where availability and speed are critical to the success of any web application.