Filter noindex status of single post?

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention.

You can easily set noindex your post from the Advanced Tab in Rank Math meta box. However, if you want to use filter to set the post noindex then you can use the following one:

add_filter( 'rank_math/frontend/robots', function( $robots ) {
	global $post;
	if( $post->ID == 1 ){		
	    $robots["index"] = 'noindex';
            $robots["follow"] = 'nofollow';
	}
	return $robots;
});

Change the post ID 1 with your actual post ID.

Here is a guide you can follow to add the filter:
https://rankmath.com/kb/wordpress-hooks-actions-filters/

Hope that helps and please don’t hesitate to let us know if you have any other questions.

Thank you.

Hello,

Glad that helped.

Please feel free to reach out to us again in case you need any other assistance.

We are here to help.

Thank you.