Obviously <tag_name> is the specific tag I'm looking for. This works beautifully and returns a json object with all the data needed. If you visit the url in the browser you'll see the json.
Store two that I'm currently building if I do the same exact thing... I am returned a collection page with products with that tag. It will not return JSON like store one. I can't find any reason for this behavior. Shopify support said store one might have a cookie causing this behavior, but that's not the case.
If anyone can explain the different behavior, I'd be very grateful- or if there's a better way to make this AJAX call I'm open to that.