Programmatically validate Schema.org structured data markup for Product and Article types

Steps

1. Use the Google Rich Results Test API to submit a URL or HTML snippet; send a POST or GET request to the Rich Results Test endpoint with the URL or code parameter
2. Alternatively, use the Schema.org validator at validator.schema.org by sending a POST request with the HTML body or structured data JSON-LD to validate against the Schema.org vocabulary
3. Parse the response for detectedItems, which lists found structured data types, and richResultsItems, which lists items eligible for rich results along with any associated errors or warnings
4. Automate validation in CI by extracting JSON-LD from rendered HTML using a DOM parser, then submitting each block to the validator endpoint and asserting zero errors
5. Cross-reference required and recommended properties for the target schema type (Product requires name and offers; Article requires headline, author, datePublished) against the detected properties in the response