If I have .xlsx file created by Excel 2019, what will be the best practice to extract data and turn into JSON format using the latest Data Hub Framework?
When inserting data into MarkLogic, you generally need its format to be either JSON, XML, CSV, text, or binary. So for your use case, you'd want to use a tool to convert that .xlsx file into one of the above formats first. There are dozens of such tools out there - pick one that works for your preferred programming language.