Restrict JSON data visible via WordPress's REST API

functions.php

<?php // Filter REST data

function filter_rest_data( $data, $post, $request ) {
  $_data = $data->data;
  $params = $request->get_params();
  if ( ! isset( $params['id'] ) ) {
    unset( $_data['date'] );
    unset( $_data['slug'] );
    unset( $_data['date_gmt'] );
    unset( $_data['modified'] );
    unset( $_data['modified_gmt'] );
    unset( $_data['guid'] );
    unset( $_data['type'] );
  };
  $data->data = $_data;
  return $data;
};

add_filter( 'rest_prepare_movies', 'filter_rest_data', 10, 3 );