What causes "invalid DateRangeType given: %s" in kataras/iris?

Pass only jsonx.WeekRange or jsonx.MonthRange

invalid DateRangeType given: %s

Error message

invalid DateRangeType given: %s

What it means

GetSimpleDateRange only supports WeekRange and MonthRange DateRangeType values; any other type panics with the invalid type printed via %s.

Source

Thrown at x/jsonx/simple_date.go:280

	// YearRange is the date range type of a year.
	YearRange DateRangeType = "year"
)

// GetSimpleDateRange returns a slice of SimpleDate between "start" and "end" pf "date"
// based on given "typ" (WeekRange, MonthRange...).
//
// Example Code:
// date := jsonx.SimpleDateFromTime(time.Now())
// dates := jsonx.GetSimpleDateRange(date, jsonx.WeekRange, time.Monday, time.Sunday)
func GetSimpleDateRange(date SimpleDate, typ DateRangeType, startWeekday, endWeekday time.Weekday) SimpleDates {
	var dates []time.Time
	switch typ {
	case WeekRange:
		dates = timex.GetWeekdays(date.ToTime(), startWeekday, endWeekday)
	case MonthRange:
		dates = timex.GetMonthDays(date.ToTime())
	default:
		panic(fmt.Sprintf("invalid DateRangeType given: %s", typ))
	}

	simpleDates := make(SimpleDates, len(dates))
	for i, t := range dates {
		simpleDates[i] = SimpleDateFromTime(t)
	}

	return simpleDates
}

View on GitHub (pinned to 7bedaf55a0)

Solutions

Pass only jsonx.WeekRange or jsonx.MonthRange
Validate/parse user input into a supported DateRangeType before calling
Recover around the call if range types are dynamic

Example fix

// before
typ := jsonx.DateRangeType(3)
dates := jsonx.GetSimpleDateRange(date, typ) // panic
// after
dates := jsonx.GetSimpleDateRange(date, jsonx.MonthRange)

Defensive patterns

Strategy: validation

Validate before calling

func validRangeType(t jsonx.DateRangeType) bool {
    return t == jsonx.WeekRange || t == jsonx.MonthRange
}
// only call GetSimpleDateRange when validRangeType(typ)

Try / catch

defer func() { if r := recover(); r != nil { log.Printf("date range panic: %v", r) } }()
dates := jsonx.GetSimpleDateRange(date, typ)

Prevention

Only use the exported WeekRange/MonthRange constants
Never use zero-value DateRangeType variables; initialize explicitly
Validate user-supplied range names against a whitelist before mapping to the type

When it happens

Trigger: Calling jsonx.SimpleDateRangeGet (GetSimpleDateRange) with a DateRangeType other than WeekRange or MonthRange, e.g. a zero-value or custom integer.

Common situations: Declaring var typ DateRangeType without initializing (zero value not WeekRange/MonthRange); parsing a user-supplied range string into an invalid type.

Understand the failure class

Background: Invalid enum value errors: "Unknown type", "Invalid scope", "must be one of" — when a string is not on the library's allowed list — this error's family across 23 libraries.

Related errors

AI-assisted analysis of kataras/iris@7bedaf55a0 (2026-08-30). Data as JSON: /api/errors/e8397920c53cbc9c. Report an issue: GitHub.