After uploading a JSON file, select the Excel format, like XLSX or XLS, depending on the version of Microsoft Excel installed on your computer. When you are done, click on the Convert button to ...

Now, opening a JSON file is not hard, however, it would make more sense to convert it to the Microsoft Excel (CSV) format for easier use. The question is, how does one convert a JSON file to Excel?

That shouldn't be a problem, after all, Excel can handle JSON. So, you try to open the file in Excel using its data import tooling, which usually works very well indeed as a basic ETL system.