Fabrik form submission issue, getting JSON response instead of thank you page
i had something similar with telerik returning results as json instead of actual page, no solution was possible so i just recreated the same telerik element again and it works now.
try creating the element from scratch and compare the difference between previous and current version, to note the issue.
i do not know much about joomla.but here is a thing your json should be in below format
{"msg": "Record added/updated","url": "index.php?option=com_content&view=article&id=24","baseRedirect": false,"rowid": "0","redirect_how": "newpage","width": 300,"height": 300,"x_offset": 0,"y_offset": 0,"title": "","reset_form": true}
your key of json should also be in double quotes.