ksym04

Turn off JSON REST API on your website to anonymous users and prevent unauthorized requests from using the REST API to get information from your website.
Since the release of WordPress 4.0 came out, there have been a lot of hackers exploiting the vulnerabilities of the REST API. By installing this plugin, you will effectively prevent and disable the use of REST API from unauthorized users and protect the information on your website from being accessible. If someone tries to access the REST API on your site, the plugin will return an authentication error on the API endpoints, for any unauthorized users trying to access it.
While WordPress REST API vulnerability exploits continue this plugin effectively prevent and disable the used of REST API from accessing information from your website, this plugin return authentication error and disable all endpoints for any user not logged in on your website.
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Turn Off REST API

Prevents unauthorized requests from using the WP REST API.

David Arnado

This plugin allows to remove the default block patterns and/or deactivate the WordPress REST API for non-authenticated users. Thus, it adds two checkboxes:
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The first checkbox allows the user to remove the core block patterns from the Gutenberg editor. This feature can be activated or deactivated.
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The second checkbox allows the user to deactivate the WordPress REST API for non-authenticated users. This feature can be activated or deactivated.
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After plugin activation, both options will be disabled by default.
Important: If the plugin is deactivated and then reactivated, then both checkboxes will need to be manually checked again.

Caledros Helper

Adds an Admin Menu that allows removing the default block patterns. It also allows deactivating the WordPress REST API for non-authenticated users.

Turn Off REST API vs Caledros Helper