Samuel Aguilera

The WordPress REST API is a great resource, but if you don’t want to use it probably you will want to close this door to your WordPress.
Unlike other popular plugins that aims to disable the REST API but only return an error, processed by the REST API, when a request is received, by default, this plugin removes all filters and actions related to WordPress REST API, and returns a 404 error for requests sent to the REST API URL endpoints, effectively blocking any use of the REST API.
Optionally you can set the REST API setting in Settings -> General page to “Logged In Only” for a less drastical action, to keep REST API access enabled but require the user to be logged in to accept the requests.
If you’re happy with the plugin <a href="https://wordpress.org/plugins/sar-disable-rest-api/reviews/?filter=5" rel="ugc">please don’t forget to give it a good rating</a>, it will motivate me to keep sharing and improving this plugin (and others).
SUPPORT: If you have any support question, please <a href="https://github.com/samuelaguilera/sar-disable-rest-api/issues" rel="nofollow ugc">create an issue at the Github repository</a>.
<h4>Requirements</h4>
<ul>
<li>WordPress 4.7 or higher.</li>
</ul>
<h4>Features</h4>
<ul>
<li>Disable WordPress core REST API for real by removing all filters and actions related to it and returning a 404 error for requests sent to REST API URL endpoints (e.g. https://example.com/wp-json/whatever ).</li>
<li>Option to require user to be logged in to use the REST API instead of completely disable it.</li>
</ul>
<h4>Usage</h4>
To disable the REST API completely simply install the plugin from the Plugins page and enable it.
If you don’t want to disable the REST API but require user to be logged in instead, go to Settings -> General page and set the REST API to option to “Logged In Only”, and click Save Changes.
You can change the option back to “Off” if you want to disable the REST API again.
To return to WordPress default, simply deactivate the plugin.

Disable REST API for Real

A simple way to disable WordPress REST API.



One click plugin

Really prevents the REST API from handling requests (default) or require user to be logged in.

Mehdi Rezaei

Custom API Creator is a powerful WordPress plugin that allows developers and site owners to create custom REST API endpoints with ease. This plugin bridges the gap between your WordPress content and custom applications, enabling you to expose your data in a flexible, secure, and organized manner.
With Custom API Creator, you can define multiple API endpoints, each with its own set of data sections. Choose which post types and fields to include, control access with user role restrictions, and customize the structure of your API responses. Whether you’re building a mobile app, integrating with a third-party service, or creating a headless WordPress setup, Custom API Creator provides the tools you need to shape your data output.
Translation : 
To contribute in translating this plugin please visit: <a href="https://translate.wordpress.org/projects/wp-plugins/custom-api-creator/" rel="nofollow ugc">WordPress Translation Repository</a>

Custom API Creator

Custom API Creator is a WordPress plugin that lets developers create flexible, customize data, and control access with role restrictions.

Disable REST API for Real vs Custom API Creator