Structured Data Check
Every JSON-LD block on the page, nested @graph structures included, is opened; each entity type and its properties are listed, and malformed blocks are shown on their own.
- No sign-up needed
- Genuine JSON parsing
- @graph structures covered
Run the tool right here on the page
Identifies the schema present on a page, whether its JSON is valid or malformed, and what has been left out.
- What it costs Free
- Data source Our own server
- Access No sign-up
The short answer
Structured data means describing a page's content in a language machines read, so Google knows the page is a product, an article or a local business. Valid schema is a necessary condition for rich results such as rating stars and FAQs, but not a sufficient one.
The principle broken most often in this field is that schema has to line up with the content the page actually shows. When schema announces rating stars while there is no user review on the page, the situation becomes worse than having no schema, because Google reads it as a form of manipulation and can shut off rich results for the entire domain. Undoing a penalty like that takes months.
The second aim of this tool is to spot conflicts. If two plugins both emit schema, a single page shows two separate Organization entities or two WebSite entities under mismatched names, and instead of picking one of them, Google usually approves neither. After each change of SEO plugin this is nearly guaranteed, because the previous plugin is often just disabled while its code still sits in the theme or the settings.
When nothing shows in the output, visit the meta tag checker first. If a page's initial code carries no schema while an SEO plugin is installed, it usually means the schema is added in the browser through JavaScript; on Google's first indexing pass that is barely different from having no schema.
The data source and method
The raw HTML is read and the application/ld+json blocks are parsed with a real json_decode, so "malformed" means truly invalid JSON, not a guess. Something we meet often in real projects: running Yoast next to another schema plugin places two separate Organization entities on one page, and Google accepts neither.
The situations where it helps
When a rich result, such as stars, FAQ entries or breadcrumbs, does not show in Google, or after installing or replacing an SEO plugin, because two plugins frequently emit schema together and the output disagrees with itself.
Where it falls short
The check here works at the grammar level, not the meaning level. We tell you the JSON is structurally sound and which entities it declares, but not whether Google will accept it for a rich result. The answer to that comes from Google's own Rich Results Test, which you should run separately. Beyond that, sound schema is no guarantee a rich result appears; Google itself decides where to show one, and across a large number of Persian queries it shows none at all. Schema supplies the opportunity, not the result.
A lesson from working with it
Detecting a malformed block here is done by genuinely parsing the JSON, not by guessing, so when we say malformed we mean truly invalid. The most common reason is a quotation mark that has slipped into the product description text and is not escaped properly. The key point is that one invalid block brings down the whole block: Google rejects it and the rest of that block's schema leaves with it, even if the other ninety-nine percent was clean.
What it costs
This tool executes on our own infrastructure with no purchased data behind it, so it costs nothing and stays that way. Its only limit is a daily cap that stops one bot from taking the whole capacity.
The daily cap is measured per visitor. If you need more, a free account lifts your limit.
Common questions about this tool
Which schema type does my site need?
The type the page actually is. An article needs Article, a product Product, a service page Service, and a business with a physical address LocalBusiness. Adding types that do not fit the page content brings no benefit and carries risk.
Is two of the same schema on one page a problem?
Yes. Two entities of the same type with different information leave Google to choose, and the usual result is that it uses neither. Keep one and remove the other entirely, not just deactivate it.
Does schema make my ranking go up?
Schema is not a ranking factor. What it does is make your result larger and more noticeable on the results page, which raises the click-through rate. That is where the real benefit sits, not in the position.