Encountering the "Updating Failed. The Response Is Not a Valid JSON Response" error in WordPress can be perplexing, but there's a surprisingly simple solution that might save you from hours of troubleshooting. The secret lies in navigating to your site's Permalinks settings and re-saving them.
Here's a step-by-step guide to this quick fix:
This seemingly unconventional solution works because it refreshes the rewrite rules in WordPress, addressing any inconsistencies that may have led to the JSON response error.
If the problem persists after re-saving Permalinks, you may need to explore other troubleshooting steps mentioned in the initial article, such as deactivating plugins, switching themes, or checking for syntax errors in your code.
Remember, always back up your website before making any changes, especially if you're dealing with troubleshooting or altering settings. While the "Updating Failed. The Response Is Not a Valid JSON Response" error can be frustrating, this quick fix might be just what you need to get your WordPress site back on track.