I use validator.schema.org alongside Google’s own tester and it has saved me more than once. Google only reports on the types that can earn rich results, so if your Organization or Author markup is broken it often just says nothing. The Schema.org validator parses everything and shows the full tree.
How I use it:
– Paste the live URL, then check the extracted tree to confirm nested items (author inside Article, offers inside Product) actually nest instead of floating as separate entities.
– Use the code snippet mode before deploying template changes, so I am not waiting on a crawl.
– Compare the count of detected items against what the plugin claims it outputs. Duplicate Organization blocks show up here fast.
Downside: it validates syntax and vocabulary, not eligibility. A page can pass here with zero warnings and still get no rich result, so you still need Google’s tool for that side.
https://validator.schema.org/
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