jakubkanna

This plugin forces all non-admin, non-AJAX, and non-REST API requests to return a 404 status code. 
Ideal for headless WordPress environments or sites that should expose only the API.

REST API Only

Force all non-admin, non-AJAX, and non-REST API requests to return a 404 for headless or API-only sites.

ben.moody

Plugin provides a framework sets up WordPress as a headless CMS.
Framework options include:
<ul>
<li>JSON Web Token Authentication (optional)</li>
<li>Adds Gutenberg block data to REST responses (optional)</li>
<li>Protects REST requests with nonce (optional)</li>
<li>Cleans up REST response objects (optional)</li>
<li>Removes non required REST endpoints (optional)</li>
<li>Disables the frontend (optional)</li>
</ul>
All modules can be enabled/disabled or configured to suit most if not all WordPress as a headless CMS use cases.
Developing a single page React app but still want to use the WordPress theme based fronted.
Not a problem, maybe you just use these modules:
<ul>
<li>Adds Gutenberg block data to REST responses</li>
<li>Protects REST requests with nonce</li>
<li>Cleans up REST response objects</li>
<li>Removes non required REST endpoints</li>
</ul>
Developing a truly headless WordPress single page app or mobile app and just want WordPress for the backend?
Maybe use these modules:
<ul>
<li>JSON Web Token Authentication</li>
<li>Adds Gutenberg block data to REST responses</li>
<li>Protects REST requests with nonce</li>
<li>Cleans up REST response objects</li>
<li>Removes non required REST endpoints</li>
<li>Disable the WordPress frontend</li>
</ul>
You get the idea.
The plugin documentation is held inside the plugin ‘options’ page in the WordPress admin, although there are some docs for the custom rest endpoints:
<a href="https://documenter.getpostman.com/view/1175138/RztkPpV4#fc567f81-ff31-442e-a236-fa247bd1fd6c" rel="nofollow ugc">Learn More about plugin endpoint requests</a>
Anyway if you are looking to use WordPress as a headless CMS on a React, React Native, Angular, iOS/Android native project. This plugin should go a long way to setting WordPress up as you need it.

WP Headless CMS Framework

I like your plugin! Keep on going with this one! :)

Plugin provides a framework sets up WordPress as a headless CMS.

REST API Only vs WP Headless CMS Framework