What Is Schema Markup? A Plain-English Guide to JSON-LD Structured Data

Multi-Toolkit Team••8 min read
SEOWeb DevelopmentMarketing
TL;DR: Schema markup (structured data) is code — usually JSON-LD — that tells Google what your content means, making your page eligible for rich results (star ratings, FAQ accordions, event dates). Generate it free with the schema markup generators.

Search engines read your words, but they don't inherently know that "4.8" is a rating, or that a block of text is a recipe, an event, or an FAQ. Schema markup spells that out in a machine-readable format — and in return, Google can show enhanced listings that take up more space and earn more clicks.

What is schema markup, exactly?

It's structured data based on the Schema.org vocabulary — a shared standard created by Google, Bing, Yahoo, and Yandex. You describe your content using defined types (Article, Product, FAQPage, Event, LocalBusiness, …) and properties (name, price, ratingValue, …).

JSON-LD vs. Microdata vs. RDFa

There are three formats, but JSON-LD is the one to use — it's Google's recommended format. Instead of weaving attributes through your HTML (Microdata/RDFa), JSON-LD sits in a single <script type="application/ld+json"> block, so it's easy to add, update, and keep separate from your markup.

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Trail Running Shoe",
  "offers": { "@type": "Offer", "price": "129.00", "priceCurrency": "USD" },
  "aggregateRating": { "@type": "AggregateRating", "ratingValue": "4.8", "reviewCount": "211" }
}
</script>

What do you actually get? (Rich results)

  • FAQ — expandable Q&A under your listing.
  • Product — price, availability, and star ratings.
  • Article — eligibility for Top Stories and richer headlines.
  • Event — date, venue, and tickets in the events carousel.
  • Local Business — hours, address, and Maps presence.
  • Breadcrumb — a readable navigation trail instead of a raw URL.

Rich results don't directly boost rankings, but they dramatically increase your listing's visual footprint and click-through rate — which is where the SEO value comes from.

Which schema type should you use?

Match the type to the page's primary content: a blog post → Article; a shop page → Product; a help page with Q&A → FAQPage; a venue or shop → LocalBusiness. You can — and often should — combine several on one page (e.g. Article + FAQPage + BreadcrumbList).

How to add schema markup in 4 steps

  1. Pick the type and generate JSON-LD with a schema generator.
  2. Paste it inside a <script type="application/ld+json"> tag in your page's <head>.
  3. Make sure the marked-up data matches what users actually see on the page.
  4. Validate with Google's Rich Results Test, then monitor in Search Console.

The one rule that gets sites penalized

Schema must reflect visible content. Marking up FAQs, reviews, or prices that aren't actually on the page is against Google's guidelines and can trigger a manual action. Generate from your real content, not aspirational data.

Free generators for every type

FAQ

Does schema guarantee rich results? No — it makes you eligible; Google decides based on quality and authority.

Where do I put it? In the <head>, as JSON-LD, ideally one script block per type.

Do meta tags replace schema? No — they're complementary. Pair schema with a strong title and meta description.

Wrapping up

Schema markup is one of the highest-leverage, lowest-effort SEO wins: a few lines of JSON-LD can turn a plain listing into a rich result. Generate it from your real content, validate it, and keep it in sync.

Generate schema markup free →

Related free tools: Schema Markup Hub · Meta Tag Generator · Robots.txt Generator · Link Checker

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