Between many of the Analytics plugin like WP Statics, Site kit from Google and the best plugin that I’ve ever used. But hold on, why I’m seeing the error message:

The response is not a valid JSON response

The problem, I finally discovered, was the popular iThemes Security plugin.

But to remove it was not the solution. Here is my steps:

1. Go to the iThemes configuration page (Security > Settings).
2. Click on the System Tweaks option.
3. Look for the Long URL Strings option.
4. Uncheck the Filter Long URL Strings option.
5. Click on Save Settings.

Nam Le, https://nready.net