DTM Data Generator for JSON supports following command line switches:

-r - if project configured, run the project at program startup

-q - quit the program after project execution.

-c - switch to 'console mode'.

-x<file.xsd> - import structure from sample JSON file.

Also, the user can provide project name as a command line parameter. Please note that you should use quotation for path or filename with spaces:
xmldg.exe "D:\Projects and Data\test1.gjspr"

The 'console mode' is a mode when the program doesn't open any windows and doesn't need any interference from the user. A project for the console mode must be prepared and tested beforehand. This mode enables the user to integrate the product with the Windows task scheduler as well as to execute projects prepared beforehand according to the schedule.