This article and guide on producing JSON-LD with Angular Universal are geared to developers that are looking to generate the JSON that signifies the Linked Data object and inject it properly in the HTML that gets generated on the server. We will re-use and describe some techniques that the TransferState key-value cache service uses to transfer server-state to the application on your client side.
First of all; What is JSON-LD? JSON-LD is a light-weight Linked Data format. It is simple for humans and machines to learn and write. It really is predicated on the already successful JSON format and ways to help JSON data interoperate at Web-scale. Linked Data empowers individuals who publish and use information on the Web. It is ways to build a network of standards-based, machine-readable data across Internet sites.
It allows a credit card application to begin at one bit of Linked Data and follow inland links to other bits of Linked Data that are hosted on different sites across the Web. These 2 explanations of JSON-LD and Linked Data were simply taken from the web site of JSON-LD. This article does not go deep into the full specification of JSON-LD and it does not teach you how to properly generate your Linked Data structures.
The tools of the JSON-ld website, such as the playground, give you all you have to to validate your Linked Data structures. What you can easily see is an example of a JSON-LD data object below, injected into the HTML. A LocalBusiness is defined because of it by after its definition and providing the properties that identify the entity.
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For example, the address, it’s geolocation, opening hours etc are given. As you can see the address has it’s own type PostalAddress. Most of the types can specify an exterior link which is how data gets interleaved on a single website or source and even on other websites. Why should you care about JSON-LD?
In the simple case of the blog or not too complex website, generating your JSON Linked Data can be carried out using the same base data you utilize to set your meta tags for public writing and SEO. Your most significant concern is building the correct structure. How your structure looks is completely dependent upon your usecase. As a basic example we will use this website, and more specifically the about page. Using the router we define the right SEO data associated with our route first. Exactly like we did before, setting the right social share meta tags.
Using a service we can sign up to route changes to extract this data and complete the info to something to parse the JSON-LD object. The JsonLdService injected above is a simple service that updates and caches the info framework we have to output. A simple implementation of the service can be as follows, where you as a developer are in charge of correctly structuring your object still. This basic example is what we wished to achieve. The next step is getting this object outputted in our static HTML.