API Reference > bentleyjs-core > Ids > Id64 > Id64.isId64 Id64.isId64 Function Determine if the input is a well-formed Id64String. For a description of "well-formed", see Working with Ids. isId64(id: string): boolean see Id64.isValidId64 Parameter Type Description id string Returns - boolean Defined in core/bentley/src/Id.ts Line 445 Last Updated: 11 June, 2024