json2map

type Json2csv struct {
	// the leading name representing root, default is empty
	RootKeyName    string
	JsonKey2MapKey func([]JsonKey) string
	// contains filtered or unexported fields
}

type JsonKey struct {
	Key string
	// if Index >= 0, it means that the object of this JsonKey is a json array,
	// and Index is the key's index of the array
	Index int
}