This extension will check structured data / rich snippets on a webpage regardless of whether it is online, on an intranet or behind a passworded page.
You can test microdata, Schema, RDFa and JSON-LD are valid.
Also, view your structured data within Google structured data testing tool.
New in November 2016: We've just added the function to export data to the clipboard!
New in December 2016: We're highlighting errors and warnings in red and orange respectively.
New in March 2017: Fixed bugs related to Micro data JSON format changes in the Google Structured Data Testing Tool.