edckwt

This plugin enables you to fetch the contents of your site in JSON format by REST API 
Such as sections, articles and search results 
and return it as json 
To be able to use it in your applications or other sites
Endpoints
<ol>
<li>recent posts</li>
<li>posts</li>
<li>search</li>
<li>categories</li>
<li>category</li>
</ol>
For develpoers
<ul>
<li>/api/get_category_posts?type={string}&slug={string}&id={int}&count={int}&page={int}</li>
<li>/api/get_category_index</li>
<li>/api/get_search_results?type={string}&count={int}&page={int}</li>
<li>/api/get_recent_posts?type={string}</li>
<li>/api/get_posts?type={string}&cat={int}&count={int}&page={int}</li>
</ul>
Parameters
<ol>
<li>slug : {string} default: empty post slug</li>
<li>id : {int} default: empty post id</li>
<li>count: {int} default: 5 data display limit</li>
<li>page : {int} default: 1 data display offset</li>
<li>type : {string} default: post post_type</li>
</ol>

EDC REST API

Fetch the content of the sections and articles and search them through the API

Kite

Due to security/privacy concerns, JSON REST API (WP API) only allows post meta data (custom field value) for authenticated users. 
This plugin is an easy way to make post meta available when unauthenticated.
After activate the plugin, go to WP API Customizer option page. 
Click the plus icon to add rows. 
Set JSON attributes and custom field names in your posts that you want to use when unauthenticated. 
The JSON REST API will provide the data as “post_meta” like the following:
<pre><code>"post_meta":{"your_attribute_a":"Custom Field A value","your_attribute_b":"Custom Field B value"}
</code></pre>

WP API Customizer

Make post meta data (custom field values) available for JSON REST API (WP API) when unauthenticated.

EDC REST API vs WP API Customizer