About the Schema Markup Validator Online Free Tool

The Schema Markup Validator Online Free Tool is a lightweight schema markup checker for JSON-LD from pasted markup, pasted HTML, or a public webpage URL. It extracts JSON-LD blocks, parses their JSON, reports detected @type values, and warns about selected fields in several commonly used schema types.

The report helps find malformed JSON-LD and basic omissions before using an official rich-results test or platform-specific validator. It does not perform complete Schema.org vocabulary validation or guarantee eligibility for a search feature.

How to Validate Schema Markup

1. Enter a public page URL, or open the additional options and paste raw JSON-LD or full HTML.
2. Select Validate Schema.
3. Review the number of blocks detected and parsed.
4. Check parse errors, field warnings, analyzed nodes, and detected @type values.
5. Correct the markup and test it again with the documentation and official validation tool for your target search feature.

Choosing an Input Method

Raw JSON-LD:
Use this mode to check one copied JSON object or array directly.

Full HTML:
Paste a page's HTML when you want the tool to extract <script type="application/ld+json"> blocks from the document.

Page URL:
URL mode uses the site's server utility to fetch the public HTML response and extract its JSON-LD blocks. It does not run the page in a browser, so schema added only after client-side JavaScript executes may not be present in the fetched HTML.

What the Schema Checker Reviews

The tool parses each extracted block as JSON, expands arrays and @graph entries for analysis, and lists unique detected types. Its built-in field checklist covers Article, BlogPosting, NewsArticle, Product, FAQPage, BreadcrumbList, Organization, WebSite, LocalBusiness, Person, and Event.

A warning means a field expected by this tool's checklist is empty or missing. A result with no warnings means only that the JSON parsed and passed this limited checklist; it does not confirm correct property types, nested structures, content policies, or current rich-result requirements.

Common Schema Validation Uses

• Finding broken JSON syntax before deploying structured data.
• Confirming that JSON-LD blocks can be extracted from pasted HTML.
• Listing schema types present in a page response.
• Spotting basic missing fields in the schema types covered by the checklist.

Schema Markup Validator FAQ

Does this validate Microdata or RDFa?
No. The tool inspects JSON-LD only.

Is it the same as Google's Rich Results Test?
No. It is a preliminary structural check and does not determine Google rich-result eligibility.

Why does URL mode find no JSON-LD when I can see schema in the browser?
The schema may be inserted later by client-side JavaScript and absent from the original HTML response fetched by the tool.

Does valid JSON-LD guarantee a rich result?
No. Search features also depend on supported schema types, required and recommended properties, page content, technical access, quality policies, and search-engine decisions.