JSON-LD stands for "JavaScript Object Notation for Linked Data". It's a way to structure data in a way that is easy to read for both humans and machines.

Here's an example of a JSON-LD object representing a publication, for instance:

{
  "@context": "http://schema.org",
  "@type": "Publication",
  "name": "My Publication",
  "author": {
    "@type": "Person",
    "name": "John Doe"
  }
}

You can read more about JSON-LD on schema.org, and test it using the Google Structured Data Testing Tool.

In particular, Buttondown sets up JSON-LD for your newsletters automatically. We create structured data for the following things:

• Your newsletter itself (with the @type of Publication)
• The author of the newsletter (with the @type of Person)
• The issues of your newsletter (with the @type of PublicationIssue)
• Comments on your newsletter (with the @type of Comment)