WordPress at a glance
filter is not described

rest_prepare_(post_type) filter-hook . WP 4.7.0

Filters the post data for a response.

The dynamic portion of the hook name, $this->post_type, refers to the post type slug.

Usage

add_filter( 'rest_prepare_(post_type)', 'filter_function_name_2083', 10, 3 );
function filter_function_name_2083( $response, $post, $request ){
	// filter...

	return $response;
}
$response(WP_REST_Response)
The response object.
$post(WP_Post)
Post object.
$request(WP_REST_Request)
Request object.

Where the hook is called

WP_REST_Posts_Controller::prepare_item_for_response()
rest_prepare_(post_type)
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 1649
return apply_filters( "rest_prepare_{$this->post_type}", $response, $post, $request );

Where the hook is used (in WP core)

Does not used.