See the JSON-LD that is really present in the server HTML
Structured-data debugging often starts with a simple question: did the markup reach the page at all? Toolmera reads application/ld+json blocks from the HTML response and reports how many were found, which ones parse as JSON and which schema types they declare.
This is useful after template changes, CMS migrations and conditional rendering bugs where the intended schema exists in code but never reaches the public HTML returned to a crawler.
Detected formatJSON-LD script blocks
Syntax checkJSON parse success or parse error
Type inventory@type values, including @graph nodes
Valid JSON is not the same as valid rich-result markup
A JSON-LD block can be perfectly valid JSON and still be incomplete for a particular Schema.org type or a Google search feature. Toolmera therefore separates syntax inspection from eligibility claims.
Use the report to catch malformed JSON, missing markup or unexpected @type values. For Google-specific rich-result requirements, continue with Google documentation or Rich Results Test because those rules change by feature and are stricter than basic JSON syntax.
Multiple schema blocks and @graph structures are normal
Modern sites often publish Organization, WebSite, BreadcrumbList, Article, Product or other entities in separate blocks or inside one @graph. The checker inventories the types it can parse instead of assuming there should be exactly one schema object.
That makes the report especially useful when plugins, themes and custom code all inject markup and you want to see the combined public result.
Server HTML and client-rendered schema can differ
The current checker reads the HTML response and does not run a full browser rendering engine. If a site injects structured data only after client-side JavaScript executes, that late markup may not appear in this report.
For SEO debugging this limitation is useful to know explicitly: the checker tells you what the server response contains, not what a fully executed browser DOM might eventually contain.