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UUIDv4 vs UUIDv5

Mappy Show answered on January 3, 2022 Popularity 8/10 Helpfulness 1/10

answer UUIDv4 vs UUIDv5

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UUIDv4 vs UUIDv5

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UUIDv4:


UUIDv4 is generated based on random numbers (pseudo-random) and does not rely on any easily reproducible data.
It is designed to generate unique identifiers that cannot be easily replayed or guessed.
UUIDv4 is commonly used when you need to ensure that the generated identifier is truly unique across your entire application.
Example: aa2bd832-191e-4d2b-98d4-b0d4778844f9

UUIDv5:


UUIDv5 is based on an initial UUID called a namespace UUID and a name string.
It is generated by hashing the concatenation of the namespace UUID and the name string using a hashing algorithm (SHA-1).
UUIDv5 is usually used for non-unique but repeatable message digest identifiers.
Example: c5edf0a4-3a4e-5a3a-8a3a-7e9f546b8cd2

To summarize, UUIDv4 is generated based on random numbers and is used when you need a unique identifier, while UUIDv5 is generated based on a namespace UUID and a name string and is used for repeatable message digest identifiers.

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Contributed on Feb 27 2024

Mappy Show

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import { v4 as uuidv4 } from 'uuid';

uuidv4(); // ⇨ '9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d'

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Contributed on Jan 03 2022

shahul

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UUIDv4 vs UUIDv5

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