go-helpers VS schema-org-json-schemas

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The "IsInteger" validator can of course be interpreted as a type, the important thing is though that it can be customized using type parameters and that we can add any number of additional validators that do advanced things (e.g. we could define an "IsPrime" validator that checks for primality of the number).

I find this more elegant than having both a "type" field and various extensions for validations that you need to remember. The validator list mechanism also makes it easy to chain validations and perform sub-validations for lists or maps. I have an open-source implementation of this written in Golang [1] that I use in all my projects. It enables me to write a form specification and a Go struct and validate as well as coerce unstructured data into the struct. It makes it very easy to validate complex, hierarchical documents like configuration files as well, is easy to extend and provides nice errors.

1: https://github.com/kiprotect/go-helpers/tree/master/forms

I'd like to offer a contrasting opinion to all of the other currently negative comments: I've used JSON schema in the past to validate outside input and it was a pleasant and straightforward experience.

There are unfortunately no standard type declarations that I'm aware of, which is a pain, but tools exist to translate schema.org schemas[1] (I have not used this myself).

[1]: https://github.com/charlestati/schema-org-json-schemas