Sergiy Dzysyak

This plugin provides simple REST API for the popular search <a href="https://wordpress.org/" title="Your favorite blogging software" rel="ugc">WordPress</a> search engine – <a href="https://wordpress.org/plugins/relevanssi/" title="A Better Search" rel="ugc">Relevanssi</a>.
As far as this plugin provides API for the Relevanssi plugin, it should be installed.
Key features
<ul>
<li>Search through posts of a certain type. By default all types.</li>
<li>Results in pagination and optional.</li>
<li>Sets X-WP-Total header with a total number of records, the same way as the default search API does.</li>
<li>Sets X-WP-TotalPages header with a total number of pages, the same way as the default search API does.</li>
<li>Multilingual websites support. Both WPML and Polylang are supported, but not tested well, so let me know if you will find any problems.</li>
<li>Taxonomy filters are supported now. Some features may be missed, so feel free to report them.</li>
<li>Ordering option added. It is also possible to order by meta_key/meta_value/meta_value_num. </li>
</ul>
Brief usage examples
<ul>
<li>https://[your domain]/wp-json/relevanssi/v1/search?keyword=query</li>
<li>https://[your domain]/wp-json/relevanssi/v1/search?keyword=query&per_page=5</li>
<li>https://[your domain]/wp-json/relevanssi/v1/search?keyword=query&per_page=5&page=2</li>
</ul>
Define post type:
<ul>
<li>https://[your domain]/wp-json/relevanssi/v1/search?keyword=query&per_page=5&page=2&type=post</li>
</ul>
Filter by taxonomy/taxonomies:
<ul>
<li>https://[your domain]/wp-json/relevanssi/v1/search?keyword=test&tax_query[0][taxonomy]=category&tax_query[0][field]=id&tax_query[0][terms]=3</li>
<li>https://[your domain]/wp-json/relevanssi/v1/search?keyword=test&tax_query[relation]=AND&tax_query[0][taxonomy]=category&tax_query[0][field]=id&tax_query[0][terms]=3&tax_query[1][taxonomy]=category&tax_query[1][field]=id&tax_query[1][terms]=2</li>
</ul>
Exclude category via taxonomies:
<ul>
<li>https://[your domain]/wp-json/relevanssi/v1/search?keyword=test&tax_query[0][taxonomy]=category&tax_query[0][field]=id&tax_query[0][terms]=3&tax_query[0][operator]=NOT IN</li>
</ul>
For multilingual websites (WPML & Polylang):
<ul>
<li>
https://[your domain]/wp-json/relevanssi/v1/search?keyword=query&lng=en
<ul>
<li>Results in order:</li>
</ul>
</li>
<li>
https://[your domain]/wp-json/relevanssi/v1/search?keyword=test&type=post&orderby=modified&order=DESC
</li>
<li>https://[your domain]/wp-json/relevanssi/v1/search?keyword=test&type=post&orderby=modified&order=ASC</li>
<li>https://[your domain]/wp-json/relevanssi/v1/search?keyword=test&type=post&meta_key=some_key&orderby=meta_value|meta_value_num&order=ASC</li>
</ul>
Demo website
You can try the plugin on our demo website http://demo.erlycoder.com/demo1/. For example, you can try the following request:
Basic: 
<a href="http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test" rel="nofollow ugc">http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test</a>
Order posts by modification time: 
<a href="http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test&type=post&orderby=modified&order=DESC" rel="nofollow ugc">http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test&type=post&orderby=modified&order=DESC</a> 
<a href="http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test&type=post&orderby=modified&order=ASC" rel="nofollow ugc">http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test&type=post&orderby=modified&order=ASC</a>
Filter posts by taxonomy (one single category): 
<a href="http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test&tax_query[0][taxonomy]=category&tax_query[0][field]=id&tax_query[0][terms]=3" rel="nofollow ugc">http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test&tax_query[0][taxonomy]=category&tax_query[0][field]=id&tax_query[0][terms]=3</a>
Filter posts by taxonomy (exclude category): 
[http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test&tax_query[0][taxonomy]=category&tax_query[0][field]=id&tax_query[0][terms]=3&tax_query[0][operator]=NOT IN](http://demo.erlycoder.com/demo1/wp-json/relevanssi/v1/search?keyword=test&tax_query[0][taxonomy]=category&tax_query[0][field]=id&tax_query[0][terms]=3&tax_query[0][operator]=NOT IN)

REST API for Relevanssi

Nice and simple plugin

The plugin provides a REST API endpoint for the Relevanssi search plugin.

This plugin is an extension for <a href="https://wordpress.org/plugins/related-posts-with-relevanssi/" rel="ugc">Suggestion Toolkit</a>. It allows to include YouTube video suggestions into suggestion blocks on your WordPress blog or website. 
Suggestions include configured number of YouTube video thumbs with titles. Mouse click on a video thumb opens video in a popup window.
<h3>!!! IMPORTANT !!!</h3>
Pay attention, that by default Google allows 100 free YouTube searches via YouTube API per day, so pay attention how many unique blocks you are creating and what cache times you are setting. 
Once free requests will be used, YouTube suggestions will no longer be added to generated suggestions till the next day. Sure you always can purchase additional requests from <a href="https://console.cloud.google.com/" rel="nofollow ugc">Google Console</a>.
Key features
<ul>
<li>Generates suggestions by keywords.</li>
<li>Opens video in a modal window by clicking on a video preview thumb.</li>
<li>Video suggestions from all YouTube videos.</li>
<li>Video suggestions from your own YouTube videos.</li>
<li>Live stream suggestions.</li>
</ul>

Suggestion Toolkit – Youtube

This plugin is an extension for Suggestion Toolkit. It allows to include YouTube video suggestions into suggestion blocks on your WordPress blog or we …

REST API for Relevanssi vs Suggestion Toolkit – Youtube