The Rich Results Test is a free tool provided by Google at search.google.com/test/rich-results that allows webmasters and developers to validate structured data markup on any publicly accessible URL or via code snippet. The tool analyses the page’s JSON-LD, Microdata, or RDFa and reports which rich result types are detected, whether the markup passes Google’s validation requirements, and lists any errors or warnings that would prevent a rich result from being eligible. It replaced the older Structured Data Testing Tool as the primary validation surface around 2020, though the older tool was later restored at schema.org for non-Google-specific validation use cases. The Rich Results Test provides a rendered DOM view, which is important for validating structured data injected by JavaScript after initial page load. Passing the test confirms eligibility but does not guarantee that Google will display a rich result in practice.