API Reference > bentleyjs-core > Ids > Id64 > Id64.isValidId64 Id64.isValidId64 Function Returns true if the input is a well-formed Id64String representing a valid Id. isValidId64(id: string): boolean see Id64.isValid see Id64.isId64 Parameter Type Description id string Returns - boolean Defined in core/bentley/src/Id.ts Line 458 Last Updated: 13 June, 2024