[froh]

json schema has nuanced and expressive constraints to validate information exchanged in json serialization.

typeschema in contrast seems to focus on describing just the structure of data with the goal to generate stubs in a wide variety of programming languages.

[oaiey]

so why not sub-setting JSON Schema? Like done with XML Infoset for example compared to XSD. And extensions are also possible to achieve POCO details as needed.