gistfile1.txt

class Chef::Provider::JsonFile < Chef::Provider::File
  def load_json(path)
    JSON.parse(::File.read(path)) rescue Hash.new
  end

  def dump_json(obj)
    JSON.pretty_generate(obj) + "\n"
  end

  def to_mash(obj)
    Mash.from_hash(obj)
  end

  def compare_content
    to_mash(load_json(@current_resource.path)) == to_mash(@new_resource.content)
  end

  def set_content
    unless compare_content
      backup @new_resource.path if ::File.exists?(@new_resource.path)
      ::File.open(@new_resource.path, "w") { |file| file.write dump_json(@new_resource.content) }
      Chef::Log.info("#{@new_resource} updated file #{@new_resource.path}")
      @new_resource.updated_by_last_action(true)
    end
  end

  def action_create
    # chef >= 10.14.0
    if respond_to?(:define_resource_requirements)
      define_resource_requirements
    else
      assert_enclosing_directory_exists!
    end
    set_content
    # chef >= 0.10.10
    if respond_to?(:enforce_ownership_and_permissions)
      updated = @new_resource.updated_by_last_action?
      enforce_ownership_and_permissions
      @new_resource.updated_by_last_action(true) if updated
    else
      set_owner unless @new_resource.owner.nil?
      set_group unless @new_resource.group.nil?
      set_mode unless @new_resource.mode.nil?
    end
  end
end

class Chef::Resource::JsonFile < Chef::Resource::File
      
  def self.attribute(attr_name, validation_opts={})
    # Ruby 1.8 doesn't support default arguments to blocks, but we have to
    # use define_method with a block to capture +validation_opts+.
    # Workaround this by defining two methods :(
    class_eval(<<-SHIM, __FILE__, __LINE__)
      def #{attr_name}(arg=nil)
        _set_or_return_#{attr_name}(arg)
      end
    SHIM

    define_method("_set_or_return_#{attr_name.to_s}".to_sym) do |arg|
      set_or_return(attr_name.to_sym, arg, validation_opts)
    end
  end

  attribute :content, :kind_of => Hash

  def initialize(name, run_context=nil)
    super
    @resource_name = :json_file
    @provider = Chef::Provider::JsonFile
  end
end

Working for me, thanks! 👍