nbmblueeye

The Plugin will help you easy to add Custom Taxonomy to your Post, Custom Post Type. 
You just input the post_type and The Name of Taxonomy, 
You should tick to hierarchical option: will become Category or become Tag);
If you want to update, remove the existing taxonomy just go to page MCT_All, this page will be used to manage your added custom taxonomy
Ordered list: 
– Existing Custom Post Type Slug: the slug name from post_type, which is the one you want to add custom taxonomy 
– New Taxonomy Name: the name of Custom Taxonomy, which you want to add. will be display on the admin menu 
– New Taxonomy Slug: add the slug of the custom taxonomy, which you want to add

My Custom Taxonomy

This Plugin will be used to add custom taxonomy onto your Post, Custom Post Type

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.

My Custom Taxonomy vs REST API Enabler