Braad

Note: You probably do not need this plugin. The REST API already supports adding the query param <code>?_embed</code> to your URL and the response will then include all “embedded media”, including the featured image, and the data you get there is exactly what this plugin gives you. The only reasons to use this plugin at this point are if you prefer to have the featured image data in a top level field in the response rather than among other embedded media in the <code>_embedded</code> field, and if you always want the featured image data in the response rather than having to ask for it with <code>?_embed</code>. I still use this plugin because I do usually want both these things, but definitely give <code>?_embed</code> a try before using this plugin. 🙂
Version 2 of the WordPress REST API returns a <code>featured_media</code> field (formerly featured_image) on the post object by default, but this field is simply the image ID.
This plugin adds a <code>better_featured_image</code> field to the post object that contains the available image sizes and urls, allowing you to get this information without making a second request.
It takes this:
<pre><code>"featured_media": 13,
</code></pre>
And turns it into this:
<pre><code>"featured_media": 13,
"better_featured_image": {
 "id": 13,
 "alt_text": "Hot Air Balloons",
 "caption": "The event featured hot air balloon rides",
 "description": "The hot air balloons from the big event",
 "media_type": "image",
 "media_details": {
 "width": 5760,
 "height": 3840,
 "file": "2015/09/balloons.jpg",
 "sizes": {
 "thumbnail": {
 "file": "balloons-150x150.jpg",
 "width": 150,
 "height": 150,
 "mime-type": "image/jpeg",
 "source_url": "http://api.example.com/wp-content/uploads/2015/09/balloons-150x150.jpg"
 },
 "medium": {
 "file": "balloons-300x200.jpg",
 "width": 300,
 "height": 200,
 "mime-type": "image/jpeg",
 "source_url": "http://api.example.com/wp-content/uploads/2015/09/balloons-300x200.jpg"
 },
 "large": {
 "file": "balloons-1024x683.jpg",
 "width": 1024,
 "height": 683,
 "mime-type": "image/jpeg",
 "source_url": "http://api.example.com/wp-content/uploads/2015/09/balloons-1024x683.jpg"
 },
 "post-thumbnail": {
 "file": "balloons-825x510.jpg",
 "width": 825,
 "height": 510,
 "mime-type": "image/jpeg",
 "source_url": "http://api.example.com/wp-content/uploads/2015/09/balloons-825x510.jpg"
 }
 },
 "image_meta": {
 "aperture": 6.3,
 "credit": "",
 "camera": "Canon EOS 5D Mark III",
 "caption": "",
 "created_timestamp": 1433110262,
 "copyright": "",
 "focal_length": "50",
 "iso": "100",
 "shutter_speed": "0.004",
 "title": "",
 "orientation": 1
 }
 },
 "post": null,
 "source_url": "http://api.example.com/wp-content/uploads/2015/09/balloons.jpg"
},
</code></pre>
The format of the response is nearly identical to what you would get sending a request to <code>/wp-json/wp/v2/media/13</code> or using <code>?_embed</code>. When no featured image has been set on the post the <code>better_featured_image</code> field will have a value of <code>null</code>.
I’ve done some basic performance tests that indicate the difference in response times with and without this plugin to be about 10-15ms for a collection of 10 posts and 0-5ms for a single post. For me this is much faster than making a second request to <code>/media/</code>, especially for multiple posts.
As of version 1.1.0, there is a filter <code>better_rest_api_featured_image</code> that allows you to add custom data to the better_featured_image field. The filter is directly on the return value of the function that returns the better_featured_image field. This can be used to do things like add custom image meta or an SVG version of the image to the response. Here’s an example of how you might use it:
<pre><code>add_filter( 'better_rest_api_featured_image', 'xxx_modify_rest_api_featured_image', 10, 2 );
/**
 * Modify the Better REST API Featured Image response.
 *
 * @param array $featured_image The array of image data.
 * @param int $image_id The image ID.
 *
 * @return array The modified image data.
 */
function xxx_modify_rest_api_featured_image( $featured_image, $image_id ) {

 // Add an extra_data_string field with a string value.
 $featured_image['extra_data_string'] = 'A custom value.';

 // Add an extra_data_array field with an array value.
 $featured_image['extra_data_array'] = array(
 'custom_key' => 'A custom value.',
 );

 return $featured_image;
}
</code></pre>
This plugin is on <a href="https://github.com/BraadMartin/better-rest-api-featured-images" title="Better REST API Featured Images" rel="nofollow ugc">on Github</a> and pull requests are always welcome. 🙂

Better REST API Featured Images

Does what id says, and it helps me a lot while building the theme in Angular2. Only one GET to have Post and Featured Image details!



Perfect! Must be in the API core

The Plugin works very well and saves time, thanks!



Works also with REST API V2

Thanks Martin.
This plugin does excectly what is says it would do.
And this should definitely be integrated in the main api code!!!



Great plugin, why is this not in the default API?

Awesome

Adds a top-level field with featured image data including available sizes and URLs to the post object returned by the REST API.

Acato

Richard Korthuis

This plugin is no longer updated, but is open for adoption 
As of Yoast SEO version 16.7 the functionality provided by this plugin is now <a href="https://developer.yoast.com/customization/apis/rest-api/" rel="nofollow ugc">part of the Yoast SEO plugin</a> itself. This plugin will no longer be updated, but is open for adoption. If you are interested in adopting this plugin, please contact the authors.
Are you using WordPress for a headless set-up, using the WP REST API? And would you like to use the Yoast SEO plugin just like you would for any other project? This plugin adds the meta tags generated by the Yoast SEO plugin to the WP REST API output, allowing your headless set-up to implement them. Also when you are using Yoast SEO Premium you have the option to retrieve redirects throught the API: this plugin adds a custom endpoint (<code>/wp-rest-yoast-meta/v1/redirects</code>) to provide those redirects in a JSON format. Since Yoast 11.0 JSON LD Schema.org data is also supported and is now also available through the WP REST API when using this plugin.
<h3>Installation from within WordPress</h3>
<ol>
<li>Visit ‘Plugins > Add New’ (or ‘My Sites > Network Admin > Plugins > Add New’ if you are on a multisite installation).</li>
<li>Search for ‘WP REST Yoast Meta’.</li>
<li>Activate the WP REST Yoast Meta plugin through the ‘Plugins’ menu in WordPress.</li>
</ol>
<h3>Installation manually</h3>
<ol>
<li>Upload the <code>wp-rest-yoast-meta</code> folder to the <code>/wp-content/plugins/</code> directory.</li>
<li>Activate the WP REST Yoast Meta plugin through the ‘Plugins’ menu in WordPress.</li>
</ol>

WP REST Yoast Meta

Adds meta tags as generated by Yoast SEO to the WP REST API. And adds a custom endpoint to retrieve all redirects as they are set in Yoast SEO Premium …

Better REST API Featured Images vs WP REST Yoast Meta