Schema.org JSON-LD Generator & Validator

What is JSON-LD and why does Google prefer it?

JSON-LD is a W3C standard for expressing structured data as linked data using JSON. Google supports three structured data formats — JSON-LD, Microdata, and RDFa — but recommends JSON-LD for most implementations because it does not require modifying page HTML, works well with dynamically generated content, and is straightforward to validate. The format uses a @context property (typically set to https://schema.org) and a @type property to declare what kind of entity the data describes. Everything else follows the Schema.org vocabulary for that type.

Rich result cheat sheet

Google supports many structured data types, but only a subset are tied to specific rich result features. The following are among the highest-value types for most sites. Rich result eligibility depends on page content quality, policy compliance, and Google's current support for the feature.

Injecting JSON-LD in Next.js or React

In Next.js App Router, inject structured data in your page component or layout. The schema object should match the visible page content exactly — Google validates against what is rendered, not just the script block.

// app/blog/[slug]/page.tsx
export default function ArticlePage({ post }) {
  const schema = {
    "@context": "https://schema.org",
    "@type": "Article",
    "headline": post.title,
    "image": post.coverImage,
    "datePublished": post.publishedAt,
    "author": { "@type": "Person", "name": post.author },
  };

  return (
    <>
      <script
        type="application/ld+json"
        dangerouslySetInnerHTML={{ __html: JSON.stringify(schema) }}
      />
      {/* page content */}
    </>
  );
}

The schema values should be derived from the same data source used to render the visible page content. Structured data that does not match visible page content violates Google's guidelines and may result in manual actions.

What valid JSON-LD does and does not guarantee

Google supports many schema.org types for structured data understanding, but only a subset are tied to specific rich result features in search. A valid, complete JSON-LD block that passes Google's Rich Results Test is a necessary condition for most rich results — but not a sufficient one. Search appearance also depends on implementation quality (structured data matching visible content), content relevance, adherence to Google's content policies, and Google's own algorithmic decisions about when to show enhanced features. Use this tool to build clean, accurate structured data, then test with Google's Rich Results Test for current eligibility.