<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.

bennettmcelwee

Code Markup is a WordPress plugin that makes it easy to include program code samples in your posts. You can even include HTML markup in the code sample; Code Markup magically knows which characters should be displayed as code and which should be rendered as HTML.
The plugin works by escaping most special HTML tags and characters so they display exactly as typed, but leaving certain ones alone so they will render as normal HTML. The default set of allowed tags is the standard formatting tags like em, strong, span and so on. You can control this explicitly, or implicitly by specifying the language of the code block. For example, in a normal code block, will be rendered as emphasised text, but in an HTML code block, will be displayed as .
(I have to use square brackets instead of angle brackets because of the WordPress Extend site formatting.)
USAGE
<ol>
<li>
Enclose any code inside a <code> block.
</li>
<li>
Use <code markup=”…” lang=”…”> to specify appearance of code.
<ul>
<li>Include any HTML markup you like in the code, for example to add emphasis to certain sections.</li>
<li>Separate <code> blocks should be nested within a <pre> block to preserve whitespace.</li>
</ul>
</li>
<li>
If you want to fine-tune how Code Markup treats your code, use the markup and lang attributes on the code tag to specify how Code Markup should handle it.
<ul>
<li><code> or <code markup=”default”> allows common HTML tags to be rendered, and displays everything else exactly as written.</li>
<li><code markup=”none”> displays content exactly as written ? no markup is rendered.</li>
<li><code markup=”all”> renders content as HTML ? all markup is rendered.</li>
<li><code markup=”em strong a”> treats , and <a> tags as HTML markup ? everything else is displayed exactly as written. You can put whatever tags you like in the markup attribute, separated by spaces. As a special case, you can include the comment tag ? this means that HTML comments <!– like this –> will be ?rendered? as normal HTML comments (i.e. not displayed).</li>
<li><code lang=”html”> or <code lang=”xhtml”> displays content exactly as written, the same as <code markup=”none”>.</li>
</ul>
</li>
<li>
The markup attribute overrides the lang attribute.
</li>
<li>
Separate <code> blocks should be nested within a <pre> block to 
preserve whitespace.
</li>
</ol>

Code Markup

Code Markup is a WordPress plugin that makes it easy to include program code samples in your posts.

wp-jsonld vs Code Markup