<h4>Why this plugin exists</h4>
Original Plugin (discontinued): https://de.wordpress.org/plugins/json-ld-for-article/
Sadly, the original plugin is not being developed anymore. So I decided to fix some bugs like invalid markup, 
 missing tags, putting objects into fields instead of just URLs for images, and implementing for more than just 
 articles.
Also, this plugin plays nicely with <a href="https://de.wordpress.org/plugins/yet-another-stars-rating/" rel="nofollow ugc">YASR – yet another star rating</a>. It will 
remove yasr’s invalid jsonld-syntax and instead use YASRs rating.
All requests are being cached and purged on page update/edit etc.
<a href="https://waffle.io/bmhm/wp-jsonld" rel="nofollow ugc"></a>
<h4>Original description</h4>
Search engines such as Google are using structured data markup in many ways—for example, to create rich snippets in search results. Search results with rich snippets will improve your click through rates and increase the number of visitors on your website.
It has been a tedious task to add the complicated Schema.org markup to your website – sometimes it wasn’t even possible due to technical constraints. Now, thanks to JSON-LD, almost any website can enjoy the benefits of structured data. For WordPress users it’s even easier thanks to this plugin.
JSON-LD for Article is simply the easiest solution to create valid schema.org microdata markup on your WordPress site automatically from your web content and its metadata. All you need to do is install and activate the plugin, and it will generate JSON-LD markup of your posts that Google and other search engines can use for rich snippets using the schema.org for articles.
Some WP themes include traditional schema.org markup embedded in the html code the theme produces. If you are using one of these themes, this plugin is probably not necessary. If the markup produced by the theme contradicts the data specified in the JSON-LD, the added information might be not be helpful at all. Thus you should check the markup provided by the theme before adding possibly unnecessary JSON-LD to your site.
On the other hand, if you use a custom theme, it is easier to use the functionality provided by the plugin than to invent the wheel again and add the markup in html. Very often, this leads to html code that is difficult to read and is not valid structural markup according to Google’s validator.
Our plugin:
<ul>
<li>Helps your site to earn rich snippets in Google’s SERP.</li>
<li>Does not depend on other plugins or external code.</li>
<li>Is simple to install: plug-and-play, no need to configure anything.</li>
</ul>

wp-jsonld

wp-jsonld is the continuation of the simplest solution to add valid schema.org microdata as JSON-LD-script to your blog posts and articles.

Antonio Sanchez

Storefront theme required.
Please report any bug or layout break you find.
Once installed this plugin adds a drop down menu to the frontend admin bar showing different options.
<h4>With this plugin you can:</h4>
<ol>
<li>Show Storefront Hooks: Select this option to see the Storefront theme’s hooks in their actual locations.</li>
<li>Show Storefront Filters: Select this option to see the Storefront theme’s filters list.</li>
<li>Show WooCommerce Hooks: Select this option to see the WooCommerce plugin’s hooks in their actual locations on your current theme. WooCommerce plugin must be active for you to see this option.</li>
<li>Display functions hooked in Storefront and WooCommerce action hooks.</li>
<li>Display remove_action() hints for hooked functions in Storefront and WooCommerce action hooks.</li>
</ol>
This plugin is built to work with the Storefront Theme.
<h4>Roadmap</h4>
<ol>
<li>Include Storefront Markup to help identifying HTML containers.</li>
<li>Include WooCommerce Markup to help identifying HTML containers.</li>
</ol>
Feel free to ask for new features.

Storefront Visual Hook Guide

Find Storefront and WooCommerce hooks (action hooks) quick and easily by seeing their actual locations inside your theme.

wp-jsonld vs Storefront Visual Hook Guide