[gunn]

Why are schemas strings?

It would seem much more natural to make them JSON structures since they're almost that anyway.

[yusufnb]

Strings make it easy to define as configs and can be implemented uniformly across different languages. In world of microservices, a Python and a Go service can easily share the schema definitions via some config files. Also strings provided the best minimalist syntax.

[ZenPsycho]

then you might as well use jsonschema.

[mikl]

Indeed, there seems to be no reason to use this instead of JSON Schema.