Generate GSTR-1 JSON File

Follow below steps to generate JSON file using ERPNext.
Setup GST Parameters: Go to Accounts > Goods and Services Tax (GST India) > GST Settings and update GST parameters.
Report GSTR-1: Go to Accounts > Goods and Services Tax (GST India) > GSTR-1. Also, you can search in awesome bar.
Select Return period and Type of Business: Update filters as per return period and type of Business ( invoice Type) to get the required data.
Download GSTR-1 Data: Go to Menu and export and download GSTR-1 Data.
GST Return Offline Tool: Open GST Offline Tool. (Download Offline Tool from GST Portal )  Press New button and update GST return type, GSTIN Fiscal Year and Tax Period in Offline Tool .
Select Section and Import GSTR-1 CSV in Offline Tool.
Generate and Download JSON file.
Upload JSON file on GST Portal.