API Reference > bentleyjs-core > Ids > Guid Guid Namespace The Guid namespace provides facilities for working with GUID strings using the "8-4-4-4-12" pattern. The GuidString type alias is used to indicate function arguments, return types, and variables which are known to be in the GUID format. Variable Name Description Guid.empty Represents the empty Guid 00000000-0000-0000-0000-000000000000 Function Name Description Guid.createValue Create a new V4 Guid value Guid.isGuid Determine whether the input string is "guid-like". Guid.isV4Guid Determine whether the input string is a valid V4 Guid string Guid.normalize Normalize a Guid string if possible. Defined in core/bentley/src/Id.ts Line 689 Last Updated: 11 June, 2024