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 provides a fast and flexible way to add recommendations of a different kinds on WordPress website pages, almost any place on the website. It provides Gutenberg block, Elementor widget, shortcode, and WordPress widget and allows you to insert suggestions in almost any place on the website.
The main goal of the plugin is the improvement of blog engagement. Usually, each blog contains a series of related posts enclosing certain topics, so readers for sure will be glad to read more than just one post. Readers will be more satisfied and your blog positions in search are going to improve.
At the same time, bloggers can suggest products from their own store WooCommerce, or eBay store. Also, our eBay extension allows us to monetize the blog with the eBay partner program recommending related products inside the blog posts.
Almost every blogger also has one or more YouTube channels and our plugin allows to recommend related YouTube videos inside the blog posts via YouTube extension.
You can find even more extensions available through the “Extensions” section of the plugin configuration. Some of them are free and some are available for a small fee. We constantly add new extensions and improve existing ones.
We encourage you to purchase premium extensions, because this supports our work. However, feel free to <a href="https://erlycoder.com/support/" title="Contact Us" rel="nofollow ugc">suggest features and report bugs</a>.
You can review key features of the plugin and features available through the extensions.
Key features
<ul>
<li>Responsive design.</li>
<li>Multiple layout styles (horizontally scrollable widget with thumbs, automatically extendable horizontal or vertical widget with thumbnails, horizontal or vertical widget with text-only recommendations).</li>
<li>Individual style for each recommendations block.</li>
<li>Powerful and configurable cache via Memcache or files.</li>
<li>Gutenberg suggestions block.</li>
<li>Suggestions shortcode.</li>
<li>Suggestions WordPress widget.</li>
<li>Elementor suggestions widget.</li>
<li>Include certain post IDs into suggestions.</li>
<li>Exclude certain post IDs from suggestions.</li>
<li>The Configurable number of posts in the widget.</li>
<li>Support of built-in WordPress search engine.</li>
<li>Support of Relevanssi search engine.</li>
<li>Support of SearchWP search engine.</li>
<li>Support of ElasticPress search engine.</li>
<li>Customizable HTML Templates for each post type. <a href="https://erlycoder.com/knowledgebase/customizing-templates-and-styles-of-suggestion-toolkit-plugin/" rel="nofollow ugc">Read how to customize</a>.</li>
<li>CSS styles are fully customizable and collected in a single CSS file. <a href="https://erlycoder.com/knowledgebase/customizing-templates-and-styles-of-suggestion-toolkit-plugin/" rel="nofollow ugc">Read how to customize</a>.</li>
</ul>
Additional features are available via extensions. You can install extensions directly from the “Extensions” sections of the plugin admin interface. Additional features are available via extensions. You can install extensions directly from the “Extensions” sections of the plugin admin interface.
<a href="https://erlycoder.com/product/suggestion-toolkit-automation/" rel="nofollow ugc">Suggestion Toolkit – Automation</a> (Free plugin)
<ul>
<li>Automatically added suggestions to the posts of a defined type.</li>
<li>Automatically generated suggestions keyword source configuration.</li>
<li>Inline suggestions in the post body after a certain number of paragraphs.</li>
<li>Inline suggestions in the post body a certain number of paragraphs before the post end.</li>
<li>Suggestions after the posts of certain types.</li>
<li>Popup suggestions after a certain % of scroll-down.</li>
<li>Suggestion types are configurable – posts, products, downloads, same as types added by extensions (for example affiliate product suggestions).</li>
<li>Layout & style can be selected – recommendations with thumbnails, text-only recommendations, and horizontal or vertical layouts.</li>
<li>Configure keyword source to build the recommendation blocks.</li>
</ul>
<a href="https://erlycoder.com/knowledgebase/related-posts-suggestions-automation/" rel="nofollow ugc">Suggestion Toolkit – Automation | Documentation & Demo </a>
<a href="https://erlycoder.com/product/relevant-related-posts-events-campaigns/" rel="nofollow ugc">Suggestion Toolkit – Events</a> (Free plugin)
<ul>
<li>Exact period of time for each named ruleset.</li>
<li>Rule keyword that will generate the recommendations.</li>
<li>Ability to select post types that will be recommended.</li>
<li>Include certain post IDs into recommendations.</li>
<li>Exclude certain post IDs from recommendations.</li>
<li>Configure % of replacement for each kind of suggestion set – custom widgets and blocks, inline suggestions (after a certain number of abstracts), suggestions after the post, popup suggestions.</li>
</ul>
<a href="https://erlycoder.com/product/relevant-related-posts-events-youtube/" rel="nofollow ugc">Suggestion Toolkit – YouTube</a> (Free plugin)
<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>
<a href="https://erlycoder.com/knowledgebase/suggestion-toolkit-youtube/" rel="nofollow ugc">Suggestion Toolkit – YouTube | Documentation & Demo </a>
<a href="https://erlycoder.com/product/relevant-related-posts-events-ebay/" rel="nofollow ugc">Suggestion Toolkit – eBay</a> (Free plugin)
<ul>
<li>eBay product suggestions by keyword.</li>
<li>eBay partner program integration.</li>
<li>eBay site selection.</li>
<li>Recommend only from the store, by store name.</li>
<li>Filters – authorized sellers only, best offers, charity only, featured only, min feedback score, free shipping, outlet seller only, the top seller only.</li>
</ul>
<a href="https://erlycoder.com/knowledgebase/suggestion-toolkit-ebay/" rel="nofollow ugc">Suggestion Toolkit – eBay | Documentation & Demo </a>
<a href="https://erlycoder.com/product/suggestion-toolkit-etsy/" rel="nofollow ugc">Suggestion Toolkit – Etsy</a> (Free plugin)
<ul>
<li>Etsy product suggestions by keyword.</li>
<li>Etsy partner program integration.</li>
<li>Recommend only from the store, by the shop ID or URL.</li>
<li>Filter by shop location.</li>
</ul>
<a href="https://erlycoder.com/knowledgebase/etsy-extension-account-affiliate-setup/" rel="nofollow ugc">Suggestion Toolkit – Etsy | Documentation & Demo </a>

Suggestion Toolkit

This plugin provides a fast and flexible way to add recommendations of a different kinds on WordPress website pages, almost any place on the website.

REST API for Relevanssi vs Suggestion Toolkit