Tim van Iersel

Adds custom field to the post & pages editor for custom JSON-ld schema markup also known as structured data. The plugin also validates if the JSON is formated correctly. <a href="http://coderisk.com/wp/plugin/websitescanner-custom-schema/RIPS-8iSfZmxGFd" rel="nofollow ugc"></a>
Add your own JSON-ld on every page, post and custom post without the <code><script></code> to show your own custom Schema markup.
Works well with the following plugins:
<ul>
<li><a href="https://wordpress.org/plugins/remove-schema/" title="Remove Schema WordPress plugin" rel="ugc">Remove Schema</a></li>
</ul>
Usecases:
With the combination of the WordPress plugin it’s easy to overwrite the schema on a specific page. 
If a plugin like Yoast SEO or other plugin or theme that generates schema you can disable the schema and add your own custom schema to the page.

Websitescanner Custom Schema

Adds custom field to the post & pages editor for custom JSON-ld schema markup also known as structured data.

Jason Creviston

Thanks for installing this simple plugin!
<ul>
<li>Use different JSON-LD markup on every page and post, if needed!</li>
<li>Use any valid JSON-LD type or class available! With this plugin, you aren’t limited to whatever form fields a developer decides to include.</li>
</ul>
Use any schema type you want! This plugin allows you to easily add highly customized JSON-LD schema markup to your pages and posts. For the most part, this is not a fill-in-the-blanks plugin. You must first create nearly all of the markup on your own. Check out the <a href="http://schema.org/docs/full.html" rel="nofollow ugc">Schema Docs</a> to help build your markup.
There are convenient ‘Author’ and ‘Website’ fill-in-the-blank form fields available for every post. I may add more in the future.
To ensure changes to your page or post markup, be sure to click the normal WordPress ‘Update’ button for the respective page or post.
IMPORTANT 
The plugin automatically adds the appropriate script tags to the header page, so don’t add them as part of your structured JSON-LD markup inside of the meta boxes.
So, when adding a single item to a meta box, it might look similar to this:
{ “@context”: “http://schema.org”, “@type”: “Organization”, “url”: “http://yourorganization.com”, “name”: “Your Organization Name” }
When adding more than one item to a meta box, use brackets around all items and separate with commas; something similar to this:
[ {“@context”: “http://schema.org”, “@type”: “Organization”, “name”: “Your Organization Name”, “url”: “http://your-organization.com” }, {“@context”: “http://schema.org”, “@type”: “Person”, “name”: “Your Name”, “url”: “http://your-personal-site.com” } ]

Open Schema Data

Add any valid schema type to your pages and posts using JSON-LD markup.

Websitescanner Custom Schema vs Open Schema Data