Below you can find an easy to use JSON-LD generator. It is a reduced version of the generator that is integrated into snip – the Structured Data and Rich Snippets Plugin for WordPress.
As mentioned above, the tool gets its data from schema.org. That is a collaborative, community activity with a mission to create, maintain, and promote schemas for structured data on the Internet. Today it’s heavily used for Technical Onpage-SEO to tell search engines more about your content on your website.