Mark 1.0, a notation that unifies JSON, HTML, JSX, XML, YAML, and more
Author of Mark Notation here. Mark is a unified notation for both object and markup data, combining the best of JSON, HTML, and XML with a clean syntax and succinct data model. I'm glad to announce the 1.0 Release of Mark. This release is just the start of a long journey to make web a better platform to store and exchange data. Your feedback welcome!
Mark 1.0, a notation that unifies JSON, HTML, JSX, XML, YAML, and more launched on July 18, 2025 with 8 votes, #2,947 of 9,223 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
Mark is a unified notation for both object and markup data, combining the best of JSON, HTML, and XML with a clean syntax.
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