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This error message, “Yoast SEO…The response is not a valid JSON response,” can be frustrating because it prevents you from updating your SEO settings or using some Yoast features. Unfortunately facing this same issue on my site last week and followed this guide and my issue is resolved. Here are some steps you can take to troubleshoot the issue:

1. <strong class=””>Check for Conflicting Plugins: Sometimes, other plugins can interfere with Yoast SEO. Try temporarily deactivating all other plugins except Yoast and see if the error persists. If the error disappears, you can start reactivating your plugins one by one to identify the culprit.
2. Clear Cache: Your browser and WordPress may be storing outdated data that’s causing the issue. Try clearing your browser cache and performing a full cache purge in your WordPress settings (Settings > WP Super Cache or your specific caching plugin).
3. Permalinks Settings: Incorrect permalink settings can sometimes lead to JSON errors. Go to Settings > Permalinks and try changing the permalink structure. Save the changes and see if the error is resolved.
4. Yoast Reinstall: In some cases, corrupted Yoast files might be the problem. Try deactivating and reinstalling the Yoast SEO plugin. Make sure to back up your website before doing this in case you encounter any additional issues.

Try these steps, it will solve your issue and get your Yoast SEO plugin working smoothly again.