diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
index 492fd7af1c..7ef5785632 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
@@ -284,62 +284,84 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 	 */
 	public function prepare_item_for_response( $post, $request ) {
 		$response = parent::prepare_item_for_response( $post, $request );
-		$data = $response->get_data();
+		$fields   = $this->get_fields_for_response( $request );
+		$data     = $response->get_data();
 
-		$data['description'] = array(
-			'raw'       => $post->post_content,
+		if ( in_array( 'description', $fields, true ) ) {
+			$data['description'] = array(
+				'raw'      => $post->post_content,
+				/** This filter is documented in wp-includes/post-template.php */
+				'rendered' => apply_filters( 'the_content', $post->post_content ),
+			);
+		}
+
+		if ( in_array( 'caption', $fields, true ) ) {
 			/** This filter is documented in wp-includes/post-template.php */
-			'rendered'  => apply_filters( 'the_content', $post->post_content ),
-		);
+			$caption         = apply_filters( 'the_excerpt', apply_filters( 'get_the_excerpt', $post->post_excerpt, $post ) );
+			$data['caption'] = array(
+				'raw'      => $post->post_excerpt,
+				'rendered' => $caption,
+			);
+		}
 
-		/** This filter is documented in wp-includes/post-template.php */
-		$caption = apply_filters( 'the_excerpt', apply_filters( 'get_the_excerpt', $post->post_excerpt, $post ) );
-		$data['caption'] = array(
-			'raw'       => $post->post_excerpt,
-			'rendered'  => $caption,
-		);
+		if ( in_array( 'alt_text', $fields, true ) ) {
+			$data['alt_text'] = get_post_meta( $post->ID, '_wp_attachment_image_alt', true );
+		}
 
-		$data['alt_text']      = get_post_meta( $post->ID, '_wp_attachment_image_alt', true );
-		$data['media_type']    = wp_attachment_is_image( $post->ID ) ? 'image' : 'file';
-		$data['mime_type']     = $post->post_mime_type;
-		$data['media_details'] = wp_get_attachment_metadata( $post->ID );
-		$data['post']          = ! empty( $post->post_parent ) ? (int) $post->post_parent : null;
-		$data['source_url']    = wp_get_attachment_url( $post->ID );
+		if ( in_array( 'media_type', $fields, true ) ) {
+			$data['media_type'] = wp_attachment_is_image( $post->ID ) ? 'image' : 'file';
+		}
 
-		// Ensure empty details is an empty object.
-		if ( empty( $data['media_details'] ) ) {
-			$data['media_details'] = new stdClass;
-		} elseif ( ! empty( $data['media_details']['sizes'] ) ) {
+		if ( in_array( 'mime_type', $fields, true ) ) {
+			$data['mime_type'] = $post->post_mime_type;
+		}
 
-			foreach ( $data['media_details']['sizes'] as $size => &$size_data ) {
+		if ( in_array( 'media_details', $fields, true ) ) {
+			$data['media_details'] = wp_get_attachment_metadata( $post->ID );
 
-				if ( isset( $size_data['mime-type'] ) ) {
-					$size_data['mime_type'] = $size_data['mime-type'];
-					unset( $size_data['mime-type'] );
+			// Ensure empty details is an empty object.
+			if ( empty( $data['media_details'] ) ) {
+				$data['media_details'] = new stdClass;
+			} elseif ( ! empty( $data['media_details']['sizes'] ) ) {
+
+				foreach ( $data['media_details']['sizes'] as $size => &$size_data ) {
+
+					if ( isset( $size_data['mime-type'] ) ) {
+						$size_data['mime_type'] = $size_data['mime-type'];
+						unset( $size_data['mime-type'] );
+					}
+
+					// Use the same method image_downsize() does.
+					$image_src = wp_get_attachment_image_src( $post->ID, $size );
+					if ( ! $image_src ) {
+						continue;
+					}
+
+					$size_data['source_url'] = $image_src[0];
 				}
 
-				// Use the same method image_downsize() does.
-				$image_src = wp_get_attachment_image_src( $post->ID, $size );
-				if ( ! $image_src ) {
-					continue;
+				$full_src = wp_get_attachment_image_src( $post->ID, 'full' );
+
+				if ( ! empty( $full_src ) ) {
+					$data['media_details']['sizes']['full'] = array(
+						'file'       => wp_basename( $full_src[0] ),
+						'width'      => $full_src[1],
+						'height'     => $full_src[2],
+						'mime_type'  => $post->post_mime_type,
+						'source_url' => $full_src[0],
+					);
 				}
-
-				$size_data['source_url'] = $image_src[0];
+			} else {
+				$data['media_details']['sizes'] = new stdClass;
 			}
+		}
 
-			$full_src = wp_get_attachment_image_src( $post->ID, 'full' );
+		if ( in_array( 'post', $fields, true ) ) {
+			$data['post'] = ! empty( $post->post_parent ) ? (int) $post->post_parent : null;
+		}
 
-			if ( ! empty( $full_src ) ) {
-				$data['media_details']['sizes']['full'] = array(
-					'file'       => wp_basename( $full_src[0] ),
-					'width'      => $full_src[1],
-					'height'     => $full_src[2],
-					'mime_type'  => $post->post_mime_type,
-					'source_url' => $full_src[0],
-				);
-			}
-		} else {
-			$data['media_details']['sizes'] = new stdClass;
+		if ( in_array( 'source_url', $fields, true ) ) {
+			$data['source_url'] = wp_get_attachment_url( $post->ID );
 		}
 
 		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
index 23b1262c3c..6ce995dc29 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
@@ -851,35 +851,79 @@ class WP_REST_Comments_Controller extends WP_REST_Controller {
 	 * @return WP_REST_Response Response object.
 	 */
 	public function prepare_item_for_response( $comment, $request ) {
-		$data = array(
-			'id'                 => (int) $comment->comment_ID,
-			'post'               => (int) $comment->comment_post_ID,
-			'parent'             => (int) $comment->comment_parent,
-			'author'             => (int) $comment->user_id,
-			'author_name'        => $comment->comment_author,
-			'author_email'       => $comment->comment_author_email,
-			'author_url'         => $comment->comment_author_url,
-			'author_ip'          => $comment->comment_author_IP,
-			'author_user_agent'  => $comment->comment_agent,
-			'date'               => mysql_to_rfc3339( $comment->comment_date ),
-			'date_gmt'           => mysql_to_rfc3339( $comment->comment_date_gmt ),
-			'content'            => array(
+
+		$fields = $this->get_fields_for_response( $request );
+		$data   = array();
+
+		if ( in_array( 'id', $fields, true ) ) {
+			$data['id'] = (int) $comment->comment_ID;
+		}
+
+		if ( in_array( 'post', $fields, true ) ) {
+			$data['post'] = (int) $comment->comment_post_ID;
+		}
+
+		if ( in_array( 'parent', $fields, true ) ) {
+			$data['parent'] = (int) $comment->comment_parent;
+		}
+
+		if ( in_array( 'author', $fields, true ) ) {
+			$data['author'] = (int) $comment->user_id;
+		}
+
+		if ( in_array( 'author_name', $fields, true ) ) {
+			$data['author_name'] = $comment->comment_author;
+		}
+
+		if ( in_array( 'author_email', $fields, true ) ) {
+			$data['author_email'] = $comment->comment_author_email;
+		}
+
+		if ( in_array( 'author_url', $fields, true ) ) {
+			$data['author_url'] = $comment->comment_author_url;
+		}
+
+		if ( in_array( 'author_ip', $fields, true ) ) {
+			$data['author_ip'] = $comment->comment_author_IP;
+		}
+
+		if ( in_array( 'author_user_agent', $fields, true ) ) {
+			$data['author_user_agent'] = $comment->comment_agent;
+		}
+
+		if ( in_array( 'date', $fields, true ) ) {
+			$data['date'] = mysql_to_rfc3339( $comment->comment_date );
+		}
+
+		if ( in_array( 'date_gmt', $fields, true ) ) {
+			$data['date_gmt'] = mysql_to_rfc3339( $comment->comment_date_gmt );
+		}
+
+		if ( in_array( 'content', $fields, true ) ) {
+			$data['content'] = array(
 				/** This filter is documented in wp-includes/comment-template.php */
 				'rendered' => apply_filters( 'comment_text', $comment->comment_content, $comment ),
 				'raw'      => $comment->comment_content,
-			),
-			'link'               => get_comment_link( $comment ),
-			'status'             => $this->prepare_status_response( $comment->comment_approved ),
-			'type'               => get_comment_type( $comment->comment_ID ),
-		);
+			);
+		}
 
-		$schema = $this->get_item_schema();
+		if ( in_array( 'link', $fields, true ) ) {
+			$data['link'] = get_comment_link( $comment );
+		}
 
-		if ( ! empty( $schema['properties']['author_avatar_urls'] ) ) {
+		if ( in_array( 'status', $fields, true ) ) {
+			$data['status'] = $this->prepare_status_response( $comment->comment_approved );
+		}
+
+		if ( in_array( 'type', $fields, true ) ) {
+			$data['type'] = get_comment_type( $comment->comment_ID );
+		}
+
+		if ( in_array( 'author_avatar_urls', $fields, true ) ) {
 			$data['author_avatar_urls'] = rest_get_avatar_urls( $comment->comment_author_email );
 		}
 
-		if ( ! empty( $schema['properties']['meta'] ) ) {
+		if ( in_array( 'meta', $fields, true ) ) {
 			$data['meta'] = $this->meta->get_value( $comment->comment_ID, $request );
 		}
 
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
index f26e87606a..3bc6b59091 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-controller.php
@@ -505,6 +505,35 @@ abstract class WP_REST_Controller {
 		return $schema['title'];
 	}
 
+	/**
+	 * Gets an array of fields to be included on the response.
+	 *
+	 * Included fields are based on item schema and `_fields=` request argument.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return array Fields to be included in the response.
+	 */
+	public function get_fields_for_response( $request ) {
+		$schema = $this->get_item_schema();
+		$fields = isset( $schema['properties'] ) ? array_keys( $schema['properties'] ) : array();
+		if ( ! isset( $request['_fields'] ) ) {
+			return $fields;
+		}
+		$requested_fields = is_array( $request['_fields'] ) ? $request['_fields'] : preg_split( '/[\s,]+/', $request['_fields'] );
+		if ( 0 === count( $requested_fields ) ) {
+			return $fields;
+		}
+		// Trim off outside whitespace from the comma delimited list.
+		$requested_fields = array_map( 'trim', $requested_fields );
+		// Always persist 'id', because it can be needed for add_additional_fields_to_object().
+		if ( in_array( 'id', $fields, true ) ) {
+			$requested_fields[] = 'id';
+		}
+		return array_intersect( $fields, $requested_fields );
+	}
+
 	/**
 	 * Retrieves an array of endpoint arguments from the item schema for the controller.
 	 *
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-post-statuses-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-post-statuses-controller.php
index e2cce55b65..afb57c801d 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-post-statuses-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-post-statuses-controller.php
@@ -195,15 +195,36 @@ class WP_REST_Post_Statuses_Controller extends WP_REST_Controller {
 	 */
 	public function prepare_item_for_response( $status, $request ) {
 
-		$data = array(
-			'name'         => $status->label,
-			'private'      => (bool) $status->private,
-			'protected'    => (bool) $status->protected,
-			'public'       => (bool) $status->public,
-			'queryable'    => (bool) $status->publicly_queryable,
-			'show_in_list' => (bool) $status->show_in_admin_all_list,
-			'slug'         => $status->name,
-		);
+		$fields = $this->get_fields_for_response( $request );
+		$data   = array();
+
+		if ( in_array( 'name', $fields, true ) ) {
+			$data['name'] = $status->label;
+		}
+
+		if ( in_array( 'private', $fields, true ) ) {
+			$data['private'] = (bool) $status->private;
+		}
+
+		if ( in_array( 'protected', $fields, true ) ) {
+			$data['protected'] = (bool) $status->protected;
+		}
+
+		if ( in_array( 'public', $fields, true ) ) {
+			$data['public'] = (bool) $status->public;
+		}
+
+		if ( in_array( 'queryable', $fields, true ) ) {
+			$data['queryable'] = (bool) $status->publicly_queryable;
+		}
+
+		if ( in_array( 'show_in_list', $fields, true ) ) {
+			$data['show_in_list'] = (bool) $status->show_in_admin_all_list;
+		}
+
+		if ( in_array( 'slug', $fields, true ) ) {
+			$data['slug'] = $status->name;
+		}
 
 		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
 		$data = $this->add_additional_fields_to_object( $data, $request );
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-post-types-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-post-types-controller.php
index 5b83f583ce..0094f4be86 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-post-types-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-post-types-controller.php
@@ -151,18 +151,49 @@ class WP_REST_Post_Types_Controller extends WP_REST_Controller {
 		$base = ! empty( $post_type->rest_base ) ? $post_type->rest_base : $post_type->name;
 		$supports = get_all_post_type_supports( $post_type->name );
 
-		$data = array(
-			'capabilities' => $post_type->cap,
-			'description'  => $post_type->description,
-			'hierarchical' => $post_type->hierarchical,
-			'viewable'     => is_post_type_viewable( $post_type ),
-			'labels'       => $post_type->labels,
-			'name'         => $post_type->label,
-			'slug'         => $post_type->name,
-			'supports'     => $supports,
-			'taxonomies'   => array_values( $taxonomies ),
-			'rest_base'    => $base,
-		);
+		$fields = $this->get_fields_for_response( $request );
+		$data   = array();
+
+		if ( in_array( 'capabilities', $fields, true ) ) {
+			$data['capabilities'] = $post_type->cap;
+		}
+
+		if ( in_array( 'description', $fields, true ) ) {
+			$data['description'] = $post_type->description;
+		}
+
+		if ( in_array( 'hierarchical', $fields, true ) ) {
+			$data['hierarchical'] = $post_type->hierarchical;
+		}
+
+		if ( in_array( 'viewable', $fields, true ) ) {
+			$data['viewable'] = is_post_type_viewable( $post_type );
+		}
+
+		if ( in_array( 'labels', $fields, true ) ) {
+			$data['labels'] = $post_type->labels;
+		}
+
+		if ( in_array( 'name', $fields, true ) ) {
+			$data['name'] = $post_type->label;
+		}
+
+		if ( in_array( 'slug', $fields, true ) ) {
+			$data['slug'] = $post_type->name;
+		}
+
+		if ( in_array( 'supports', $fields, true ) ) {
+			$data['supports'] = $supports;
+		}
+
+		if ( in_array( 'taxonomies', $fields, true ) ) {
+			$data['taxonomies'] = array_values( $taxonomies );
+		}
+
+		if ( in_array( 'rest_base', $fields, true ) ) {
+			$data['rest_base'] = $base;
+		}
+
 		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
 		$data    = $this->add_additional_fields_to_object( $data, $request );
 		$data    = $this->filter_response_by_context( $data, $context );
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index e93ccfbb4a..031bdd1735 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -1400,20 +1400,20 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 
 		setup_postdata( $post );
 
-		$schema = $this->get_item_schema();
+		$fields = $this->get_fields_for_response( $request );
 
 		// Base fields for every post.
 		$data = array();
 
-		if ( ! empty( $schema['properties']['id'] ) ) {
+		if ( in_array( 'id', $fields, true ) ) {
 			$data['id'] = $post->ID;
 		}
 
-		if ( ! empty( $schema['properties']['date'] ) ) {
+		if ( in_array( 'date', $fields, true ) ) {
 			$data['date'] = $this->prepare_date_response( $post->post_date_gmt, $post->post_date );
 		}
 
-		if ( ! empty( $schema['properties']['date_gmt'] ) ) {
+		if ( in_array( 'date_gmt', $fields, true ) ) {
 			// For drafts, `post_date_gmt` may not be set, indicating that the
 			// date of the draft should be updated each time it is saved (see
 			// #38883).  In this case, shim the value based on the `post_date`
@@ -1426,7 +1426,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			$data['date_gmt'] = $this->prepare_date_response( $post_date_gmt );
 		}
 
-		if ( ! empty( $schema['properties']['guid'] ) ) {
+		if ( in_array( 'guid', $fields, true ) ) {
 			$data['guid'] = array(
 				/** This filter is documented in wp-includes/post-template.php */
 				'rendered' => apply_filters( 'get_the_guid', $post->guid, $post->ID ),
@@ -1434,11 +1434,11 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			);
 		}
 
-		if ( ! empty( $schema['properties']['modified'] ) ) {
+		if ( in_array( 'modified', $fields, true ) ) {
 			$data['modified'] = $this->prepare_date_response( $post->post_modified_gmt, $post->post_modified );
 		}
 
-		if ( ! empty( $schema['properties']['modified_gmt'] ) ) {
+		if ( in_array( 'modified_gmt', $fields, true ) ) {
 			// For drafts, `post_modified_gmt` may not be set (see
 			// `post_date_gmt` comments above).  In this case, shim the value
 			// based on the `post_modified` field with the site's timezone
@@ -1451,27 +1451,27 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			$data['modified_gmt'] = $this->prepare_date_response( $post_modified_gmt );
 		}
 
-		if ( ! empty( $schema['properties']['password'] ) ) {
+		if ( in_array( 'password', $fields, true ) ) {
 			$data['password'] = $post->post_password;
 		}
 
-		if ( ! empty( $schema['properties']['slug'] ) ) {
+		if ( in_array( 'slug', $fields, true ) ) {
 			$data['slug'] = $post->post_name;
 		}
 
-		if ( ! empty( $schema['properties']['status'] ) ) {
+		if ( in_array( 'status', $fields, true ) ) {
 			$data['status'] = $post->post_status;
 		}
 
-		if ( ! empty( $schema['properties']['type'] ) ) {
+		if ( in_array( 'type', $fields, true ) ) {
 			$data['type'] = $post->post_type;
 		}
 
-		if ( ! empty( $schema['properties']['link'] ) ) {
+		if ( in_array( 'link', $fields, true ) ) {
 			$data['link'] = get_permalink( $post->ID );
 		}
 
-		if ( ! empty( $schema['properties']['title'] ) ) {
+		if ( in_array( 'title', $fields, true ) ) {
 			add_filter( 'protected_title_format', array( $this, 'protected_title_format' ) );
 
 			$data['title'] = array(
@@ -1491,7 +1491,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			$has_password_filter = true;
 		}
 
-		if ( ! empty( $schema['properties']['content'] ) ) {
+		if ( in_array( 'content', $fields, true ) ) {
 			$data['content'] = array(
 				'raw'       => $post->post_content,
 				/** This filter is documented in wp-includes/post-template.php */
@@ -1500,7 +1500,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			);
 		}
 
-		if ( ! empty( $schema['properties']['excerpt'] ) ) {
+		if ( in_array( 'excerpt', $fields, true ) ) {
 			/** This filter is documented in wp-includes/post-template.php */
 			$excerpt = apply_filters( 'the_excerpt', apply_filters( 'get_the_excerpt', $post->post_excerpt, $post ) );
 			$data['excerpt'] = array(
@@ -1515,35 +1515,35 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			remove_filter( 'post_password_required', '__return_false' );
 		}
 
-		if ( ! empty( $schema['properties']['author'] ) ) {
+		if ( in_array( 'author', $fields, true ) ) {
 			$data['author'] = (int) $post->post_author;
 		}
 
-		if ( ! empty( $schema['properties']['featured_media'] ) ) {
+		if ( in_array( 'featured_media', $fields, true ) ) {
 			$data['featured_media'] = (int) get_post_thumbnail_id( $post->ID );
 		}
 
-		if ( ! empty( $schema['properties']['parent'] ) ) {
+		if ( in_array( 'parent', $fields, true ) ) {
 			$data['parent'] = (int) $post->post_parent;
 		}
 
-		if ( ! empty( $schema['properties']['menu_order'] ) ) {
+		if ( in_array( 'menu_order', $fields, true ) ) {
 			$data['menu_order'] = (int) $post->menu_order;
 		}
 
-		if ( ! empty( $schema['properties']['comment_status'] ) ) {
+		if ( in_array( 'comment_status', $fields, true ) ) {
 			$data['comment_status'] = $post->comment_status;
 		}
 
-		if ( ! empty( $schema['properties']['ping_status'] ) ) {
+		if ( in_array( 'ping_status', $fields, true ) ) {
 			$data['ping_status'] = $post->ping_status;
 		}
 
-		if ( ! empty( $schema['properties']['sticky'] ) ) {
+		if ( in_array( 'sticky', $fields, true ) ) {
 			$data['sticky'] = is_sticky( $post->ID );
 		}
 
-		if ( ! empty( $schema['properties']['template'] ) ) {
+		if ( in_array( 'template', $fields, true ) ) {
 			if ( $template = get_page_template_slug( $post->ID ) ) {
 				$data['template'] = $template;
 			} else {
@@ -1551,7 +1551,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			}
 		}
 
-		if ( ! empty( $schema['properties']['format'] ) ) {
+		if ( in_array( 'format', $fields, true ) ) {
 			$data['format'] = get_post_format( $post->ID );
 
 			// Fill in blank post format.
@@ -1560,7 +1560,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			}
 		}
 
-		if ( ! empty( $schema['properties']['meta'] ) ) {
+		if ( in_array( 'meta', $fields, true ) ) {
 			$data['meta'] = $this->meta->get_value( $post->ID, $request );
 		}
 
@@ -1569,7 +1569,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		foreach ( $taxonomies as $taxonomy ) {
 			$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
 
-			if ( ! empty( $schema['properties'][ $base ] ) ) {
+			if ( in_array( $base, $fields, true ) ) {
 				$terms = get_the_terms( $post, $taxonomy->name );
 				$data[ $base ] = $terms ? array_values( wp_list_pluck( $terms, 'term_id' ) ) : array();
 			}
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
index 298fcc5748..7d8e9212c9 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
@@ -331,43 +331,42 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 
 		setup_postdata( $post );
 
-		$schema = $this->get_item_schema();
+		$fields = $this->get_fields_for_response( $request );
+		$data   = array();
 
-		$data = array();
-
-		if ( ! empty( $schema['properties']['author'] ) ) {
+		if ( in_array( 'author', $fields, true ) ) {
 			$data['author'] = (int) $post->post_author;
 		}
 
-		if ( ! empty( $schema['properties']['date'] ) ) {
+		if ( in_array( 'date', $fields, true ) ) {
 			$data['date'] = $this->prepare_date_response( $post->post_date_gmt, $post->post_date );
 		}
 
-		if ( ! empty( $schema['properties']['date_gmt'] ) ) {
+		if ( in_array( 'date_gmt', $fields, true ) ) {
 			$data['date_gmt'] = $this->prepare_date_response( $post->post_date_gmt );
 		}
 
-		if ( ! empty( $schema['properties']['id'] ) ) {
+		if ( in_array( 'id', $fields, true ) ) {
 			$data['id'] = $post->ID;
 		}
 
-		if ( ! empty( $schema['properties']['modified'] ) ) {
+		if ( in_array( 'modified', $fields, true ) ) {
 			$data['modified'] = $this->prepare_date_response( $post->post_modified_gmt, $post->post_modified );
 		}
 
-		if ( ! empty( $schema['properties']['modified_gmt'] ) ) {
+		if ( in_array( 'modified_gmt', $fields, true ) ) {
 			$data['modified_gmt'] = $this->prepare_date_response( $post->post_modified_gmt );
 		}
 
-		if ( ! empty( $schema['properties']['parent'] ) ) {
+		if ( in_array( 'parent', $fields, true ) ) {
 			$data['parent'] = (int) $post->post_parent;
 		}
 
-		if ( ! empty( $schema['properties']['slug'] ) ) {
+		if ( in_array( 'slug', $fields, true ) ) {
 			$data['slug'] = $post->post_name;
 		}
 
-		if ( ! empty( $schema['properties']['guid'] ) ) {
+		if ( in_array( 'guid', $fields, true ) ) {
 			$data['guid'] = array(
 				/** This filter is documented in wp-includes/post-template.php */
 				'rendered' => apply_filters( 'get_the_guid', $post->guid, $post->ID ),
@@ -375,14 +374,14 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 			);
 		}
 
-		if ( ! empty( $schema['properties']['title'] ) ) {
+		if ( in_array( 'title', $fields, true ) ) {
 			$data['title'] = array(
 				'raw'      => $post->post_title,
 				'rendered' => get_the_title( $post->ID ),
 			);
 		}
 
-		if ( ! empty( $schema['properties']['content'] ) ) {
+		if ( in_array( 'content', $fields, true ) ) {
 
 			$data['content'] = array(
 				'raw'      => $post->post_content,
@@ -391,7 +390,7 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 			);
 		}
 
-		if ( ! empty( $schema['properties']['excerpt'] ) ) {
+		if ( in_array( 'excerpt', $fields, true ) ) {
 			$data['excerpt'] = array(
 				'raw'      => $post->post_excerpt,
 				'rendered' => $this->prepare_excerpt_response( $post->post_excerpt, $post ),
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php
index 0af4ec4e97..23d6bacf74 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-taxonomies-controller.php
@@ -177,17 +177,56 @@ class WP_REST_Taxonomies_Controller extends WP_REST_Controller {
 	 */
 	public function prepare_item_for_response( $taxonomy, $request ) {
 		$base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
-		$data = array(
-			'name'         => $taxonomy->label,
-			'slug'         => $taxonomy->name,
-			'capabilities' => $taxonomy->cap,
-			'description'  => $taxonomy->description,
-			'labels'       => $taxonomy->labels,
-			'types'        => $taxonomy->object_type,
-			'show_cloud'   => $taxonomy->show_tagcloud,
-			'hierarchical' => $taxonomy->hierarchical,
-			'rest_base'    => $base,
-		);
+
+		$fields = $this->get_fields_for_response( $request );
+		$data   = array();
+
+		if ( in_array( 'name', $fields, true ) ) {
+			$data['name'] = $taxonomy->label;
+		}
+
+		if ( in_array( 'slug', $fields, true ) ) {
+			$data['slug'] = $taxonomy->name;
+		}
+
+		if ( in_array( 'capabilities', $fields, true ) ) {
+			$data['capabilities'] = $taxonomy->cap;
+		}
+
+		if ( in_array( 'description', $fields, true ) ) {
+			$data['description'] = $taxonomy->description;
+		}
+
+		if ( in_array( 'labels', $fields, true ) ) {
+			$data['labels'] = $taxonomy->labels;
+		}
+
+		if ( in_array( 'types', $fields, true ) ) {
+			$data['types'] = $taxonomy->object_type;
+		}
+
+		if ( in_array( 'show_cloud', $fields, true ) ) {
+			$data['show_cloud'] = $taxonomy->show_tagcloud;
+		}
+
+		if ( in_array( 'hierarchical', $fields, true ) ) {
+			$data['hierarchical'] = $taxonomy->hierarchical;
+		}
+
+		if ( in_array( 'rest_base', $fields, true ) ) {
+			$data['rest_base'] = $base;
+		}
+
+		if ( in_array( 'visibility', $fields, true ) ) {
+			$data['visibility'] = array(
+				'public'             => (bool) $taxonomy->public,
+				'publicly_queryable' => (bool) $taxonomy->publicly_queryable,
+				'show_admin_column'  => (bool) $taxonomy->show_admin_column,
+				'show_in_nav_menus'  => (bool) $taxonomy->show_in_nav_menus,
+				'show_in_quick_edit' => (bool) $taxonomy->show_in_quick_edit,
+				'show_ui'            => (bool) $taxonomy->show_ui,
+			);
+		}
 
 		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
 		$data = $this->add_additional_fields_to_object( $data, $request );
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
index 3342742b93..42bfd6653e 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
@@ -685,42 +685,42 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 	 */
 	public function prepare_item_for_response( $item, $request ) {
 
-		$schema = $this->get_item_schema();
+		$fields = $this->get_fields_for_response( $request );
 		$data   = array();
 
-		if ( ! empty( $schema['properties']['id'] ) ) {
+		if ( in_array( 'id', $fields, true ) ) {
 			$data['id'] = (int) $item->term_id;
 		}
 
-		if ( ! empty( $schema['properties']['count'] ) ) {
+		if ( in_array( 'count', $fields, true ) ) {
 			$data['count'] = (int) $item->count;
 		}
 
-		if ( ! empty( $schema['properties']['description'] ) ) {
+		if ( in_array( 'description', $fields, true ) ) {
 			$data['description'] = $item->description;
 		}
 
-		if ( ! empty( $schema['properties']['link'] ) ) {
+		if ( in_array( 'link', $fields, true ) ) {
 			$data['link'] = get_term_link( $item );
 		}
 
-		if ( ! empty( $schema['properties']['name'] ) ) {
+		if ( in_array( 'name', $fields, true ) ) {
 			$data['name'] = $item->name;
 		}
 
-		if ( ! empty( $schema['properties']['slug'] ) ) {
+		if ( in_array( 'slug', $fields, true ) ) {
 			$data['slug'] = $item->slug;
 		}
 
-		if ( ! empty( $schema['properties']['taxonomy'] ) ) {
+		if ( in_array( 'taxonomy', $fields, true ) ) {
 			$data['taxonomy'] = $item->taxonomy;
 		}
 
-		if ( ! empty( $schema['properties']['parent'] ) ) {
+		if ( in_array( 'parent', $fields, true ) ) {
 			$data['parent'] = (int) $item->parent;
 		}
 
-		if ( ! empty( $schema['properties']['meta'] ) ) {
+		if ( in_array( 'meta', $fields, true ) ) {
 			$data['meta'] = $this->meta->get_value( $item->term_id, $request );
 		}
 
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
index 375d79e8a8..b5c2071cd8 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php
@@ -837,78 +837,78 @@ class WP_REST_Users_Controller extends WP_REST_Controller {
 	public function prepare_item_for_response( $user, $request ) {
 
 		$data   = array();
-		$schema = $this->get_item_schema();
+		$fields = $this->get_fields_for_response( $request );
 
-		if ( ! empty( $schema['properties']['id'] ) ) {
+		if ( in_array( 'id', $fields, true ) ) {
 			$data['id'] = $user->ID;
 		}
 
-		if ( ! empty( $schema['properties']['username'] ) ) {
+		if ( in_array( 'username', $fields, true ) ) {
 			$data['username'] = $user->user_login;
 		}
 
-		if ( ! empty( $schema['properties']['name'] ) ) {
+		if ( in_array( 'name', $fields, true ) ) {
 			$data['name'] = $user->display_name;
 		}
 
-		if ( ! empty( $schema['properties']['first_name'] ) ) {
+		if ( in_array( 'first_name', $fields, true ) ) {
 			$data['first_name'] = $user->first_name;
 		}
 
-		if ( ! empty( $schema['properties']['last_name'] ) ) {
+		if ( in_array( 'last_name', $fields, true ) ) {
 			$data['last_name'] = $user->last_name;
 		}
 
-		if ( ! empty( $schema['properties']['email'] ) ) {
+		if ( in_array( 'email', $fields, true ) ) {
 			$data['email'] = $user->user_email;
 		}
 
-		if ( ! empty( $schema['properties']['url'] ) ) {
+		if ( in_array( 'url', $fields, true ) ) {
 			$data['url'] = $user->user_url;
 		}
 
-		if ( ! empty( $schema['properties']['description'] ) ) {
+		if ( in_array( 'description', $fields, true ) ) {
 			$data['description'] = $user->description;
 		}
 
-		if ( ! empty( $schema['properties']['link'] ) ) {
+		if ( in_array( 'link', $fields, true ) ) {
 			$data['link'] = get_author_posts_url( $user->ID, $user->user_nicename );
 		}
 
-		if ( ! empty( $schema['properties']['locale'] ) ) {
+		if ( in_array( 'locale', $fields, true ) ) {
 			$data['locale'] = get_user_locale( $user );
 		}
 
-		if ( ! empty( $schema['properties']['nickname'] ) ) {
+		if ( in_array( 'nickname', $fields, true ) ) {
 			$data['nickname'] = $user->nickname;
 		}
 
-		if ( ! empty( $schema['properties']['slug'] ) ) {
+		if ( in_array( 'slug', $fields, true ) ) {
 			$data['slug'] = $user->user_nicename;
 		}
 
-		if ( ! empty( $schema['properties']['roles'] ) ) {
+		if ( in_array( 'roles', $fields, true ) ) {
 			// Defensively call array_values() to ensure an array is returned.
 			$data['roles'] = array_values( $user->roles );
 		}
 
-		if ( ! empty( $schema['properties']['registered_date'] ) ) {
+		if ( in_array( 'registered_date', $fields, true ) ) {
 			$data['registered_date'] = date( 'c', strtotime( $user->user_registered ) );
 		}
 
-		if ( ! empty( $schema['properties']['capabilities'] ) ) {
+		if ( in_array( 'capabilities', $fields, true ) ) {
 			$data['capabilities'] = (object) $user->allcaps;
 		}
 
-		if ( ! empty( $schema['properties']['extra_capabilities'] ) ) {
+		if ( in_array( 'extra_capabilities', $fields, true ) ) {
 			$data['extra_capabilities'] = (object) $user->caps;
 		}
 
-		if ( ! empty( $schema['properties']['avatar_urls'] ) ) {
+		if ( in_array( 'avatar_urls', $fields, true ) ) {
 			$data['avatar_urls'] = rest_get_avatar_urls( $user->user_email );
 		}
 
-		if ( ! empty( $schema['properties']['meta'] ) ) {
+		if ( in_array( 'meta', $fields, true ) ) {
 			$data['meta'] = $this->meta->get_value( $user->ID, $request );
 		}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index f2aa6a9088..713d9de317 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9.8-alpha-43444';
+$wp_version = '4.9.8-alpha-43445';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.