[user5994461]

JSON has a well defined schema system that works across languages. http://json-schema.org/

Python comes with the jsonschema module out of the box.

[calvins]

What do you mean by 'out of the box'? jsonschema needs to be installed. It's not in the stdlib.

[StavrosK]

That's rather verbose, though. I prefer the much more functional "schema" library:

https://github.com/keleshev/schema

[ris]

Thing is, none of these are language agnostic. jsonschema is the only one that makes an attempt at that.

It's a slight pity that the python jsonschema package doesn't support some of the more powerful recent features though.