The source – developers.google.com
Google Search Central now has a structured data validation page. It shows two tools: Rich Results Validation and Schema.org Markup Validator.
These tools have complementary functions: the Rich Result Test is used to validate the markup for rich results on Google, and the Schema Markup Validator is used for other data types available in the Schema.org dictionary.
In July 2020 Google announced that the Rich Results tool would soon be shutting down as the beta phase ended. Many SEOs have responded with a request to leave the tool. At the end of the year, Google moved it to Schema.org.
Now, on the previous page of the structured data validation tool, redirection to the new one is configured, where both tools are now available in one place.