If you want to set an expiration date and password when sharing Excel files online, here is how you can do that. It is possible to do both of them when using Excel Online.

Use these free online JSON to Excel converter tools to convert JSON files to Excel format. These are the best websites to do so.

While you won't be able to edit Excel files with the iPad's Quick Look file viewer, you will be able to view them and even copy and paste data from them.