Tunoff JSON Rest API - Wordpress

Wordpress has introduced REST API Future from 4.4 version, this addition will makes it possible to access our content using JSON API, Which is good for other user to access your content easily.

To disable the REST API and don't want to use REST API

Add the code beloe to your theme ->  functions.php

add_filter('json_enabled', '__return_false');
add_filter('json_jsonp_enabled', '__return_false');