Data Folder: save JSON files to this folder.
Encoding: file encoding.
JSON Format: Array With Name / Array Without Name / MongoDB Export Format / JSON Lines / One By One / Value As File.
Map Columns For Similars Files: if the source items is similar, you can set it to True, to show column-mapping grid, then you can select columns, set destination column names.
Select All: select all columns.
Select None: select none columns.