Katachi

# Step 1: Load the gem
require 'katachi'
Kt = Katachi
# Step 2: Describe the shape in plain Ruby
shape = {
    :$uuid => {
        email: :$email,
        first_name: String,
        last_name: String,
        dob: Kt::AnyOf[Date, nil],
        admin_only: Kt::AnyOf[
          {Symbol => String},
          :$undefined
        ],
        Symbol => Object,
    },
}
# Step 3: Check if you got a match
Kt.compare(value: api_response.body, shape:).match?