How to Fix a JSON String Error

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  • January 21, 2014

A JSON String Error is a generic error that users may encounter when trying to upload a file to an assignment or forum post, or when trying to upload a photo to their Moodle profile.


Most errors are caused by using an Internet browser that is not sufficiently compliant with Moodle.

● An internet browser is the program that you use to access the internet. Some common browsers include Microsoft Internet Explorer, Google Chrome, and Mozilla Firefox.

● Try uploading your file or picture with Firefox if you encounter this error and are not using the Mozilla Firefox browser.

○ You can download the Firefox browser at the Firefox website ( at no cost if you do not have it on your computer.

● Contact Technical Support by calling 1-800-985-9781, opening the Help Center in Moodle and starting a chat, or sending an email to if you encounter this issue while using Mozilla Firefox.  The error may need to be fixed by a Technical Support Specialist.