Before we start writing any code, you must ensure your browser supports the newer JavaScript features we'll use in the application. Your browser has to support ES Modules (import and export), the Fetch API, and async / await. You need at least Version 61 of Google Chrome or Version 60 of Firefox. You can check which version you're currently using by selecting About Chrome or About Firefox from the menu bar. I'm currently running the application with Chrome Version 67 and Firefox Version 61 without any issues.