We are currently developing a web application using .NET Core and React, which involves integrating with various APIs. Throughout the project, we are making AJAX calls to fetch data from these APIs. Our continuous integration and continuous deployment (CI/CD) setup requires us to modify the API URLs depending on the environment during deployments. In C#, we utilize appsettings.json for managing connection strings, custom settings, and more, which can be updated easily during deployments. Can you suggest any similar methods or tools that we can use for handling such configurations in JavaScript? Any advice would be greatly appreciated!