Livr - Data validation language

Livr, aka Language Independent Validation Rules, is a data validation language created in 2012 by Viktor Turskyi.

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Language Independent Validation Rules Specification

Livr website
Livr is developed on GitHub and has 277 stars
Livr first developed in https://github.com/koorchik/LIVR/issues
livr-spec.org was registered in 2013
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Example from the web:

{
    name: 'required',
    phone: {max_length: 10},
    address: {nested_object: {
        city: 'required',
        zip: ['required', 'positive_integer']
    }}
}