grafana/k6 · error

delimiter must be a single character

Error message

delimiter must be a single character

What it means

Error "delimiter must be a single character" thrown in grafana/k6.

Source

Thrown at internal/js/modules/k6/experimental/csv/module.go:340

		SkipFirstLine: false,
		AsObjects:     null.BoolFrom(false),
	}
}

// newParserOptions creates a new options instance from the given Sobek object.
func newParserOptionsFrom(obj *sobek.Object) (options, error) {
	options := newDefaultParserOptions()

	if obj == nil {
		return options, nil
	}

	if v := obj.Get("delimiter"); v != nil {
		delimiter := v.String()

		// A delimiter is gonna be treated as a rune in the Go code, so we need to make sure it's a single character.
		if len(delimiter) > 1 {
			return options, fmt.Errorf("delimiter must be a single character")
		}

		options.Delimiter = rune(delimiter[0])
	}

	if v := obj.Get("skipFirstLine"); v != nil {
		options.SkipFirstLine = v.ToBoolean()
	}

	if v := obj.Get("fromLine"); v != nil {
		options.FromLine = null.IntFrom(v.ToInteger())
	}

	if v := obj.Get("toLine"); v != nil {
		options.ToLine = null.IntFrom(v.ToInteger())
	}

	if v := obj.Get("asObjects"); v != nil {

View on GitHub (pinned to 93accf6570)

When it happens

Trigger: Thrown at internal/js/modules/k6/experimental/csv/module.go:340 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/0b382c479b5a2aaa. Report an issue: GitHub.