Disable WP REST API requests for logged out users

disable-logged-out-users.php

<?php

add_filter( 'rest_authentication_errors', function( $result ) {
	if ( ! empty( $result ) ) {
		return $result;
	}
	if ( ! is_user_logged_in() ) {
		return new WP_Error( 'restx_logged_out', 'Sorry, you must be logged in to make a request.', array( 'status' => 401 ) );
	}
	return $result;
});

https://developer.wordpress.org/rest-api/using-the-rest-api/frequently-asked-questions/#require-authentication-for-all-requests
According to the official FAQ, it's a "good practice" to add lines 4-6; what I am missing here to protect the data?

Hi, any idea to perform the same require authentification for 1 or more custom posts types only ? Not for all REST API request.
thx

@Nayir you can add the show_in_rest argument by user permission like

`
$show_in_rest = current_user_can( 'edit_others_posts' );

register_post_type('mycpt', array(
'show_in_rest' => $show_in_rest
));

`