To Download JSON file without HSN summary, please follow below mentioned steps:
Step 1: Go to Reports section.
Step 2: Click on GSTR1 report under Taxes, and click on 
GSTR1 JSON.
Step 3: Select the Date range, and click on Download.
Note: If Add HSN Summary in GSTR1 JSON is selected, you can unclick it and then click on Download.
