How to export json file in Tally Prime
Gateway of Tally > Display > Statutory Reports > GST Reports > GSTR-3B.
Alternatively, press Alt+G (Go To) > type or search GSTR-3B > press Enter.
F2: Period – select the period for which returns need to be filed.
Press Alt+E (Export) and select E-Return from the menu.
Select JSON (Data Interchange) as the File Format.
Enter the export location in the Folder path field.
Retain the File Name of the GSTR-3B JSON file. Press Enter.
Click Send to export.
Upload the JSON file to the portal for filing returns.