The official Google tool for testing your structured data to see which Google rich results can be generated by the structured data on your page. You can also ...
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How to test Google structured data?
Test your structured data Google recommends that you start with the Rich Results Test to see what Google rich results can be generated for your page. For generic schema validation, use the Schema Markup Validator to test all types of schema.org markup, without Google-specific validation.
What is structured data in Google search?
Google uses structured data to understand the content on the page and show that content in a richer appearance in search results, which is called a rich result. To make your site eligible for appearance as one of these rich results, follow the guide to learn how to implement structured data on your site.
What tools can be used to test structured data implementation?

12 Structured Data Testing Tools

Google Rich Results Test.
Google Search Console Structured Data Report.
Merkle Schema Markup Generator.
Microsoft Bing Markup Validator.
Schema.org.
SEO Site Checkup Structured Data Test.
Structured Data Linter.
USON-LD Playground.
What tool can you use to test for errors in structured data markup?
Navigate to Google's Rich Results Testing Tool and enter the URL of the page you want to assess. This tool precisely examines your structured data markup, highlighting errors, warnings, and valid items.
Test your publicly accessible page to see which rich results can be generated by the structured data it contains. Learn more . Structured data gallery.
Pilot Webmaster Tools' Search Queries data in Google Analytics · Introducing ... The new Structured Data Testing Tool better reflects how Google interprets a web ...
Put structured data on your page to enable special features in Google Search results, then test it with the Rich Results test.