The "Unexpected token in JSON at position 0" error in QuickBooks Online (QBO) typically indicates a problem with the data being transmitted between your web browser and the QuickBooks Online servers. This error can occur due to various reasons, such as network issues, browser cache problems, or conflicts with browser extensions. Here are some steps you can take to resolve the issue of Unexpected Token in JSON at Position 0 QuickBooks.

Clear Browser Cache

Clearing the cache and cookies in your web browser can often resolve issues related to stored data. Go to your browser's settings and find the option to clear browsing data. Make sure to clear the cache and cookies for all time or from the beginning of time.

Try a different Browser

If you are encountering the error in a specific browser, try accessing QuickBooks Online using a different web browser to see if the issue persists. This can help identify if the problem is browser-specific.

Disable Browser Extensions

Some browser extensions or add-ons can interfere with the proper functioning of QuickBooks Online. Temporarily disable any extensions you have installed and then try accessing QuickBooks Online again.

Check your Internet Connection

Ensure that you have a stable and reliable internet connection. If your connection is weak or intermittent, it can cause errors while transmitting data. Try restarting your modem/router or contacting your internet service provider if necessary.

Update your Browser

Make sure you are using the latest version of your web browser. Outdated browser versions can have compatibility issues with QuickBooks Online. Check for any available updates and install them if needed.