We'll be using the NASA APOD API to demonstrate how to add query parameters to a web application, enhancing both user experience and developer experience. The API accepts various parameters, including date, start_date, end_date, and count, with specific constraints on which parameters can be used together. By displaying a dropdown menu for users to select their desired search method and populating the relevant input fields accordingly, we can make this intuitive for the end user. We'll store the user's selection as query parameters in the page's URL, allowing us to easily keep track of their choices and use them to make API calls. The process involves validating the query parameters, using validated values to populate input fields and make API calls, and starting a simple data flow where input by the user updates the query params, which are then used as input for the application itself. This approach enables us to create an intuitive experience while simplifying the development process with an SDK that can generate client libraries in multiple languages.