Golang: Parse JSON field name from a struct field

.go

// ParseFieldName takes a reflected struct field and returns the JSON name for the field,
// as well if the field is ignored by JSON (using `json:"-"`).
func ParseFieldName(f reflect.StructField) (name string, ignore bool) {
	tag := f.Tag.Get("json")

	if tag == "" {
		return f.Name, false
	}

	if tag == "-" {
		return "", true
	}

	if i := strings.Index(tag, ","); i != -1 {
		if i == 0 {
			return f.Name, false
		} else {
			return tag[:i], false
		}
	}

	return tag, false
}