Hi, I released Shale, a Ruby gem that allows you to parse JSON, YAML and XML and convert it into Ruby data structures, as well as serialize your Ruby data model to JSON, YAML or XML.

Features:

- convert JSON, XML or YAML into Ruby data model

- serialize data model to JSON, XML or YAML

- generate JSON and XML Schema from Ruby models

- compile JSON Schema into Ruby models (compiling XML Schema is a work in progress)

A quick example so you can get a feel of it:

  require 'shale'

  class Address < Shale::Mapper
    attribute :street, Shale::Type::String
    attribute :city, Shale::Type::String
  end

  class Person < Shale::Mapper
    attribute :first_name, Shale::Type::String
    attribute :last_name, Shale::Type::String
    attribute :address, Address
  end

  # parse data and convert it into Ruby data model
  person = Person.from_json(<<~JSON) # or .from_xml / .from_yaml
  {
    "first_name": "John",
    "last_name": "Doe",
    "address": {
      "street": "Oxford Street",
      "city": "London"
    }
  }
  JSON

  # It will give you
  # =>
  #  #<Person:0xa0a4
  #    @address=#<Address:0xa0a6
  #      @city="London",
  #      @street="Oxford Street",
  #      @zip="E1 6AN">,
  #    @age=50,
  #    @first_name="John",
  #    @hobbies=["Singing", "Dancing"],
  #    @last_name="Doe",
  #    @married=false>

  # serialize Ruby data model to JSON
  Person.new(
    first_name: 'John',
    last_name: 'Doe',
    address: Address.new(street: 'Oxford Street', city: 'London')
  ).to_json # or .to_xml / .to_yaml

Source code is available on GitHub: https://github.com/kgiszczak/shale