Now you can use JSON-LD for your structured data markup for products and/or reviews rich snippets in Google. Also make sure to validate your markup, as Google is now enforcing requirements.
Google announced that they now support JSON-LD for structured data markup for reviews and products rich snippets.
John Mueller, a Google Webmaster Trends analyst, added that Google also “cleaned up some of our application logic.” So now, when Google has specific requirements, they may now enforce it better. The example John gave was “for explicit reviewed item and correct property name values are now enforced.”
courtesy:- Search Engine Land