How to generate a valid UUID v4 that starts with specific characters?
Suppose I want to generate UUID v4 that starts with 00 – short of looping through random UUIDs until I get UUID that starts with 00, is there a better way of doing it?
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Luc Gagan
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find a UUIDv4 generator, modify it to your specs - or simply replace the first two characters with `00` - since a v4 UUID is purely random, this is perfectly valid to do – Jaromanda X May 22 '23 at 01:33
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I presume you're aware, but doing this will increase [collision probability](https://stackoverflow.com/a/24876263/438273) (in a insignificant way, practically, of course) — it might be useful to simply prefix the full UUID if your string length isn't constrained — or just prefix a different UID schema (e.g. [`nanoid`](https://github.com/ai/nanoid#comparison-with-uuid)). – jsejcksn May 22 '23 at 02:59
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You can just remove the first two characters of a generated UUID and prepend "00" in its place.
console.log('00' + crypto.randomUUID().slice(2));
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This answers it, but this answer providers more context https://stackoverflow.com/a/76302739/21936721 – Luc Gagan May 27 '23 at 06:17