Windows Legacy GUID Parser

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library 0.2.1 ·javascript
verified May 27, 2026

win-guid is a JavaScript/TypeScript module designed for encoding and decoding Windows legacy GUIDs, which adhere to a mixed-endianness byte layout distinct from RFC 9562 UUIDs. This format is crucial when working with various Microsoft and firmware standards, including COM, OLE, CFBF (Structured Storage), GPT, UEFI, Windows Registry, and Active Directory objectGUID values. The package provides utilities to parse canonical GUID strings into `Uint8Array`s and a `Guid` helper class for object-oriented manipulation. The current stable version is 0.2.1, with recent updates focusing on minor bug fixes and documentation improvements. It explicitly differentiates itself from RFC 9562 UUID libraries (like `uuidjs/uuid`) by handling the specific Windows byte order reordering in the first three fields, making it indispensable for interoperability with binary Microsoft formats.

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