How do I create a GUID / UUID?

salon_sue

How do I create GUIDs (globally-unique identifiers) in JavaScript? The GUID / UUID should be at least 32 characters and should stay in the ASCII range to avoid trouble when passing them around. I'm not sure what routines are available on all browsers, how "random" and seeded the built-in random number generator is, etc.

Originally asked by Jason Cohen on Stack Exchange (stackoverflow) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

[Edited 2023-03-05 to reflect latest best-practices for producing RFC4122-compliant UUIDs] crypto.randomUUID() is now standard on all modern browsers and JS runtimes. However, because new browser APIs are restricted to secure contexts , this method is only available to pages served locally ( localhost or 127.0.0.1 ) or over HTTPS. For readers interested in other UUID versions, generating UUIDs on legacy platforms or in non-secure contexts, there is the uuid module . It is well-tested and supported. Failing the above, there is this method (based on the original answer to this question): function uuidv4() { return "10000000-1000-4000-8000-100000000000".replace(/[018]/g, c => (+c ^...

Full answer by broofa: https://stackoverflow.stackexchange.com/a/2117523 (CC BY-SA 4.0).

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