glanceapp/glance · error

marshaling %s: %v

Error message

marshaling %s: %v

What it means

Error "marshaling %s: %v" thrown in glanceapp/glance.

Source

Thrown at internal/glance/widget-custom-api.go:119

}

func (o *customAPIOptions) FloatOr(key string, defaultValue float64) float64 {
	return customAPIGetOptionOrDefault(*o, key, defaultValue)
}

func (o *customAPIOptions) BoolOr(key string, defaultValue bool) bool {
	return customAPIGetOptionOrDefault(*o, key, defaultValue)
}

func (o *customAPIOptions) JSON(key string) string {
	value, exists := (*o)[key]
	if !exists {
		panic(fmt.Sprintf("key %q does not exist in options", key))
	}

	encoded, err := json.Marshal(value)
	if err != nil {
		panic(fmt.Sprintf("marshaling %s: %v", key, err))
	}

	return string(encoded)
}

func customAPIGetOptionOrDefault[T any](o customAPIOptions, key string, defaultValue T) T {
	if value, exists := o[key]; exists {
		if typedValue, ok := value.(T); ok {
			return typedValue
		}
	}
	return defaultValue
}

func (req *CustomAPIRequest) initialize() error {
	if req == nil || req.URL == "" {
		return nil
	}

View on GitHub (pinned to 91324e8de7)

Solutions

1. Ensure the option value being marshaled is JSON-serializable (no channels, functions, or cyclic structures).
2. Pass plain values (strings, numbers, booleans, maps, slices) in the custom-api request options.

When it happens

Trigger: Occurs when a value stored in the custom-api options map cannot be marshaled to JSON, e.g. a channel, function, or cyclic structure.

Common situations: Passing a non-JSON-serializable decoded response value into the options map used by the template.

AI-assisted analysis of glanceapp/glance@91324e8de7 (2026-08-15). Data as JSON: /api/errors/7a57e45c2da826de. Report an issue: GitHub.