MrXHellboy

This plugin offers your visitors the possibility search on post tags. 
All you have to do is install this plugin and create a page and add the following shortcode: [tagsarchive]
The following CSS classes and divisions are added to this plugin so you are able to customize the look in your own stylesheet. 
This because when i update the plugin, no work will be lost on your side.
form#form-search-tags, span.error, form#form-search-tags legend, form#form-search-tags fieldset, span.headings, form#form-search-tags h3
<h3>Development Blog</h3>
<a href="http://online-source.net/category/scripts/wordpress-plugins/" title="Online-Source WordPress plugins" rel="nofollow ugc">Online-Source WordPress plugins</a>
<h3>Development</h3>
Version 1.1: Fixed: error message added if both fields (tagname like and tagname is) are empty. 
Version 1.2: Fixed: shows no tags anymore which have a usage of 0.

Advanced tag search

This plugin offers your visitors the possibility search on post tags.

Galaxy Weblinks

Advanced WP REST API is a WP REST API plugin that provides custom endpoints, to the WordPress REST API. You can enable API routes through a convenient settings panel and then manage the API requests and responses.
Features:
<ul>
<li>
Validate the user
</li>
<li>
Handle Post request
</li>
<li>
Handle User request
</li>
<li>
Handle Product request
</li>
</ul>
Note: The API method must be a POST method.
Here’s a link to the documentation for the plugin. This will help you learn more about its features and how to use it. 
<a href="https://wp-plugins.galaxyweblinks.com/wp-plugins/advanced-wp-rest-api/doc/" rel="nofollow ugc">Documentation</a>
For any feedback or queries regarding this plugin, please contact our <a href="https://wp-plugins.galaxyweblinks.com/contact/" rel="nofollow ugc">Support team</a>.

Advanced WP REST API

This plugin provides custom endpoints to the WordPress REST API.

Advanced tag search vs Advanced WP REST API