Sorry, I haven't worked with any JS tools to extract microdata. That said, you might be interested in JSON-LD though, a different form of structured data that would be a lot easier to parse in JS. (I'll be writing a post about that soon, as well as a few other types)
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Nice article, well written, has lots of useful info.
Do you happen to know if there any javascript tools to extract the microdata into some kind of data structure?
Sorry, I haven't worked with any JS tools to extract microdata. That said, you might be interested in JSON-LD though, a different form of structured data that would be a lot easier to parse in JS. (I'll be writing a post about that soon, as well as a few other types)