Offline Upload and Download for GSTR-1 Quickbook Json File have error

The error may appear when there's an issue with the browser, Raviraj.

There are times that your browser is full of frequently accessed page resources causing the error when uploading a GSTR-1  file in JSON.

Let's perform some troubleshooting steps to fix the error. You can open your QuickBooks Online (QBO) account using a private window to check if you can upload GSTR-1 without getting an error. Use these keyboard shortcuts based on the browser you're using.

• For Firefox or Microsoft Edge, press Ctrl + Shift + P.
• For Chrome, press Ctrl + Shift + N.
• For Safari, hold down Command + Shift + N.

If this works, you can clear your regular browser's cache so the system can start fresh. But if you get the same results while using a private browser, use a different browser instead.

I've added an article to view different details on how GST works in QBO: How GST impacts QuickBooks users.

Please reach back out to me with any additional information on the issue so, I can get you taken care of. Have a wonderful day!