gistfile1.js

    config: {
        validate: {
            payload: Joi.object().keys({
                state: Joi.string(),
                county: Joi.string(),
                city: Joi.string(),
                zip: Joi.number().integer()
            }).with('county', 'state').with('city', 'state').without('state', 'zip').without('county', 'city')
        }
    }