SEO Schema Markup is a 100% free, open-source toolkit for creating and validating JSON-LD structured data. Fill in a simple form and get valid schema.org markup in real time, with required fields flagged in red and recommended fields in amber, so your output passes Google's Rich Results Test before you paste it into your site. Already have markup? Paste your JSON-LD or raw HTML into the validator and see exactly which properties are missing. Everything runs in your browser, and there is no signup and no data collection. It is built by WebSensePro and released under the MIT license.

The red/amber split between required and recommended fields is a nice touch. For the Product generator, can it output an Offer per variant when a product has several price points, or does it assume a single price? A lot of usage-priced products end up with an AggregateOffer that Google treats differently from a list of Offers.

The red/amber split between required and recommended fields is a nice touch. For the Product generator, can it output an Offer per variant when a product has several price points, or does it assume a single price? A lot of usage-priced products end up with an AggregateOffer that Google treats differently from a list of Offers.
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