UUID vs GUID: Differences, Compatibility, and When to Use Each
Compare UUID and GUID: format differences, Microsoft vs IETF standards, case sensitivity, and database compatibility considerations.
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Tags: developer-tools, uuid, guid
UUID vs GUID: Differences, Compatibility, and When to Use Each If you have spent any time in cross-platform development, you have seen both "UUID" and "GUID" in documentation, APIs, and database schemas. The short answer: they refer to the same thing. The longer answer involves a bit of history, some formatting quirks, and a few practical differences in how each ecosystem expresses the concept. A Brief History Microsoft needed a way to identify COM interfaces and classes uniquely across all machines. They adopted the DCE RPC UUID specification (which predates RFC 4122) and called their implementation "GUID." When RFC 4122 was standardised in 2005, it formalised the existing practice — including the UUID version structure. Meanwhile, the broader developer community settled on "UUID." Java,…
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