gofiber/fiber · error

minLen constraint requires an argument

Error message

minLen constraint requires an argument

What it means

Error "minLen constraint requires an argument" thrown in gofiber/fiber.

Source

Thrown at constraint.go:337

func (datetimeConstraintType) Execute(param string, data []any) bool {
	if len(data) == 0 {
		return false
	}
	layout, ok := data[0].(string)
	if !ok || layout == "" {
		return false
	}
	_, err := time.Parse(layout, param)
	return err == nil
}

type minLenConstraintType struct{}

func (minLenConstraintType) Name() string { return ConstraintMinLen }
func (minLenConstraintType) Analyze(args []string) ([]any, error) {
	args = parseConstraintArgs(args)
	if len(args) == 0 {
		return nil, errors.New("minLen constraint requires an argument")
	}
	n, err := strconv.Atoi(args[0])
	if err != nil {
		return nil, fmt.Errorf("parse constraint arg: %w", err)
	}
	return []any{n}, nil
}

func (minLenConstraintType) Execute(param string, data []any) bool {
	if len(data) == 0 {
		return false
	}
	limit, ok := data[0].(int)
	if !ok {
		return false
	}
	return len(param) >= limit
}

View on GitHub (pinned to 9a4c7e57fe)

When it happens

Trigger: Thrown at constraint.go:337 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of gofiber/fiber@9a4c7e57fe (2026-08-04). Data as JSON: /data/errors/8e680925e719532c.json. Report an issue: GitHub.