JSON-LD, or JavaScript Object Notation for Linked Data, is a WC3 standard website technique of implementing structured markup using the JSON notation.
It employs a ranking system of name-value pairings, is easy to use, and is less prone to human mistakes.
It was created to communicate information using linked or structured data vocabularies, such as schema.org. It is the most practical way to add semantics to raw JSON data if many documents are stored in a file or database. Furthermore, if you do not have access to your website's pages, you can upload structured data to the top of your HTML page, making context more legible by humans if it is not heavily mixed with HTML layout code.

JSON-LD on web pages is understood by major search engines like Google, Yandex, and Bing and many smaller search engines like Addictomatic, BoardReader, and TwitterSearch.
Include relevant, concise, high-quality material, together with links and reviews regarding a particular query product, to make your context stand out on a search engine results page.
Search engines will "notice" well-presented structured data embedded in the web page and return it in rich search results, potentially increasing the page's click-through rate.

JSON-LD allows a message to use short names as object keys, but still have those keys represent full URIs, which can represent the qualified names,

How to Add Structured Data to a Website?

Follow these steps to add JSON-LD to your page:

Choose the type of structured markup you’d like to create from the drop down on the left.
Fill out the form on the left as much as possible.
When complete, copy the newly generated JSON-LD on the right.
Paste JSON-LD in the <head> section of your HTML document.
Test implementation with the structured data testing tool.

Structured Data Example

data snippet that might appear within the Event code page

<script type="application/ld+json">
{
  "@context": "https://schema.org/",
  "@type":  "Event",
  "name": "",
  "eventAttendanceMode": "https://schema.org/OnlineEventAttendanceMode",
  "eventStatus": "https://schema.org/EventScheduled",
  "startDate": "",
  "location": [
    {
      "@type": "VirtualLocation",
      "url": ""
    }
  ]
}
</script>

Benefits of Structured Data Solutions

Social media and search engines companies are keen to index structured data markups in web-based content. Thus, it makes good sense for companies to revamp their websites with structured content on all their websites and make it easier for websites that search and social media websites to index their pages. By adding structured content that search engines can quickly index will provide numerous benefits immediately that include:

Increased Conversions - the more users you attract to your website and the more likely they'll buy something, dramatically increasing the conversion rate.
Improve Your SERPs by improving your SERPS, also known as search pages, implies that the more your site's content is indexable by engine search results, the more your website will rank in the search engines.
More ROI - by increasing your search engine rank in terms of click-through rate, click-through ratio, and conversion rates, translate to a more ignificant ROI for your money.
Improve your CTR Improve your SERPs - Increasing your site's rank will increase your CTR (or click-through), making users more likely to click it.

Why is JSON-LD the most suitable structure for data that is structured?

The benefits of using JSON-LD for writing structured data in comparison to other formats, such as microdata, are the following:

It makes use of linked data
It does not lead to any performance issues of the site because it can be loaded in an asynchronous fashion
Web-based developers can easily reuse it since it adheres to the JSON syntax
It is added to the page without affecting the current HTML tag structure or

Everyone by now presumably knows about the danger of premature optimization. I think we should be just as worried about premature design - designing too early what a program should do.
Paul Graham