API Reference > bentleyjs-core > Ids > Id64 > Id64.isInvalid Id64.isInvalid Function Returns true if the input is a well-formed Id64String representing an invalid Id. isInvalid(id: string): boolean see Id64.isValid Parameter Type Description id string Returns - boolean Defined in core/bentley/src/Id.ts Line 501 Last Updated: 12 June, 2024