You can convert JSON files to Microsoft Excel CSV file formats using this hidden built-in feature. We show you how to do it.

How to Recover a Microsoft Excel File That Is Not in a Recognizable Format. If Microsoft Excel fails to recognize a file in the XLSX or XLS format, the data contained in the file could be corrupted.

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

And you might have a file that was created by another application (such as an app or service that generates JSON files) and you need that file converted to CSV format.