UUID Generator

About our UUID Generator

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What is UUID?

A Universally Unique Identifier (UUID) is a 128-bit identifier that does not match with any other UUID in the world. UUIDs are usually shown as 36-character strings, often separated into five groups by hyphens like ‘550e8400-e29b-41d4-a716756655440000’ (PostgreSQL Data Types video). Using these identifiers guarantees complete unambiguousness of different entities or even their parts and prevents collisions by creating duplicates.

Algorithms Behind UUID Generation

UUID Version 1

A time-based UUID, commonly named as version 1 of the Unique Identifier (UUID), utilizes a machine address card or MAC address connected to cards installed on computers’ network slots and also summarizes its current timestamp so that it will generate an identifier number. This guarantees that the UUIDs generated by the same machine at different times are unique, and they can be partially sorted on their creation timestamp. Although this approach offers distinctive features, it is not appropriate where privacy or security matter at all since the MAC address gets exposed.

UUID Version 4

UUID Version 4, that otherwise is known as random UUID, creates identifiers from either definite or unspecified randomness. The result of this method is independent from the MAC address or timestamp of the network card, which is a good approach when it comes to privacy and security considerations. The characteristic of the Version 4 UUID is its randomness, which leads to a highly unique value and it will almost never collide.

Types of UUID

UUIDs are available in a number of types, each of which fulfills its own particular role. As mentioned above, the most popular editions are Version 1 and Version 4. Other variants thereof include Version 3 and Version 5, which are created by a namespace followed by the name.

UUID Version 3 and Version 5

Version 3 and version 5 As for the UUID function, it returns a universal unique identifier value that is based on Version of DCE using either MD5 or SHA-1 as hash.

Version 3 and Version5 UUIDs are created by applying cryptographic hash functions on a namespace identifier together with name. Such text is frequently used if a specific namespace has to produce some unique identifier; for example, this could be URL or domain name.

UUID in Python

Python has an inbuilt ‘uuid’ module for the creation of UUIDs.

python

import uuid

# Generate a Version 4 UUID

my_uuid = uuid.uuid4()
print(my_uuid)

One of the advantages that the uuids python module has to offer is a variety of functions for generating various UUID versions, which simplifies work with identifying numbers in Python applications.

UUID in JavaScript

For the purposes of JavaScript, libraries such as ‘uuid’ or just ‘uuid js’ are available which can be used for UUID generation.

javascript

const uuid = require('uuid');

// Generate a Version 4 UUID

const myUUID = uuid.v4();

console.log(myUUID);

These libraries provide clean and succinct API for handling UUIDs inside JavaScript applications working in the browser or on server-side.

How To Use Our UUID Generator

• Simply Click on “Generate” your UUID
• Afterwards, you can easily copy it by clicking on the Copy button.

FAQs

What is a UUID, and why is it important?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. It's essential for ensuring that every entity, such as a record or file, has a unique identifier, especially in distributed systems or databases.

How is a Version 4 UUID different from other versions?

A Version 4 UUID is randomly generated, making it more secure and less predictable compared to time-based UUIDs like Version 1, which rely on timestamps and MAC addresses.

What are the security implications of using UUIDs?

While UUIDs are generally secure, Version 1 UUIDs may expose system information like MAC addresses. For better privacy, use Version 4 UUIDs, which are generated randomly.

Are UUIDs guaranteed to be unique?

UUIDs are designed to be globally unique, with the likelihood of two UUIDs colliding being extremely low, especially when using Version 4 UUIDs.

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