code: func (j *JSON) Setup() error {
  	r, err := j.gen()
  	if err != nil {
  		return err
  	}
  
  	dec := json.NewDecoder(r)
  	j.values = make(map[string]interface{})
  
  	return dec.Decode(&j.values)
  }
docs: //Setup initializes the JSON Checker