Mickey Kay

Like this plugin? Please consider <a href="https://wordpress.org/support/view/plugin-reviews/rest-api-enabler" rel="ugc">leaving a 5-star review</a>.
By default, custom post types and custom fields are not accessible via the WordPress REST API. REST API Enabler allows you to:
<ol>
<li>Enable the WP REST API for custom post types and specify WP REST API custom endpoints.</li>
<li>Choose which custom fields to include in WP REST API responses for posts, pages, and custom post types.</li>
</ol>
All enabled custom field data is included in the REST API response, nested under the <code>rest_api_enabler</code> key, like so:
<pre><code>[
 {
 "id": 179,
 "date": "2016-07-03T18:06:50",
 "title": {
 "rendered": "Test Job"
 },
 .
 .
 .
 "rest_api_enabler": {
 "custom_meta_1": "Value 1",
 "custom_meta_2": "Value 2",
 "custom_meta_3": [
 "Array value 1",
 "Array value 2"
 ]
 }
 }
]
</code></pre>
Note: prior to verion 1.1.0, all meta keys were included as top-level keys in the API response. Additionally, all values were returned as arrays, regardless of whether the original value was actually an array. This functionality is now deprecated as it risks key-name collisions. Please reference the <code>rest_api_enabler</code> top-level key instead.
<h4>Usage</h4>
<ol>
<li>Activate the plugin, then go to Settings → REST API Enabler in the admin.</li>
<li>Click the Post Types tab to enable/disable post types and customize their endpoints.</li>
<li>Click the Post Meta tab to enable/disable post meta (custom fields).</li>
</ol>
NOTE: by default, the plugin does not display settings for protected post meta (post meta that begins with an underscore and is intended for internal use only). If you wish to include protected post meta in the plugin settings, you can use the <code>rae_include_protected_meta</code> filter to do so. The following code can be placed in your theme’s <code>functions.php</code> file, or in a custom plugin (on <code>init</code> priority 10 or earlier):
<pre><code>add_filter( 'rae_include_protected_meta', '__return_true' );
</code></pre>

REST API Enabler

Enable the WP REST API to work with custom post types, custom fields, and custom endpoints.

KrishaWeb

Dilip Bheda

Pratik Gandhi

Girish Panchal

This plugin gives flexibility to user to change posts from one post type to another. Also users can change posts from post type to page.
Features 
• Easy installation 
• Post to other post type or page. 
• Free support
Checkout the advanced features of Post Type Transfer: 
• It provides functionality enable/disable the feature for certain post type. 
• It also provides functionality to transfer the taxonomy while transferring the post to other post type. You can create new taxonomy or use the current one.
<a href="https://codecanyon.net/item/post-type-transfer-pro/21585540" rel="nofollow ugc">Get the Post Type Transfer Pro</a>
<h4>Supported Types</h4>
The plugin will help you to transfer any post’s post type to other post type. It will also allow custom post type. Invisible post types like revision, menu and attachment are purposely excluded

Post Type Transfer

Easy to use

A simple way to change a post's post-type in WordPress

REST API Enabler vs Post Type Transfer