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JavaScript UUID Generation: A Comprehensive Guide

In today’s digital age, unique identifiers are a must-have for various applications. One such identifier is UUID, which stands for Universally Unique Identifier. It is a 128-bit number used to uniquely identify information in computer systems. If you’re working with JavaScript and want to generate UUIDs, this article is for you.

JavaScript UUID Generation

We’ll explore how to generate UUIDs in JavaScript. We’ll start by discussing what UUIDs are, why they are important, and where they are used. We’ll then dive into the details of generating UUIDs in JavaScript, including the different types of UUIDs and the various libraries that can be used for generating them.

What is a UUID?

A UUID is a 128-bit number that is used to uniquely identify information in computer systems. It is composed of 32 hexadecimal characters (0-9, a-f) grouped in five sections separated by hyphens. The five sections consist of eight, four, four, four, and twelve hexadecimal characters, respectively. UUIDs are typically represented in the form of xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, where x is a hexadecimal digit.

Why are UUIDs important?

UUIDs are important because they provide a way to uniquely identify information in computer systems. This is particularly useful in distributed systems, where multiple computers or applications may be accessing the same data. In such scenarios, UUIDs ensure that each piece of information can be uniquely identified, even if it is replicated across multiple systems.

Where are UUIDs used?

UUIDs are used in a variety of applications, including databases, message queues, and web applications. They are particularly useful in situations where there is a need to identify data across multiple systems or where there is a risk of collisions (i.e., two pieces of data having the same identifier).

How to generate UUIDs in JavaScript

There are several ways to generate UUIDs in JavaScript. One way is to use the built-in crypto API, which provides a random number generator that can be used to generate UUIDs. Here is an example:

function generateUUID() {

let cryptoObj = window.crypto || window.msCrypto; // for IE 11

let array = new Uint8Array(16);


array[6] &= 0x0f;

array[6] |= 0x40;

array[8] &= 0x3f;

array[8] |= 0x80;

let hex = Array.from(array, function(byte) {

return (‘0’ + byte.toString(16)).slice(-2);


return hex.substr(0, 8) + ‘-‘ + hex.substr(8, 4) + ‘-‘ + hex.substr(12, 4) + ‘-‘ + hex.substr(16, 4) + ‘-‘ + hex.substr(20);


This function generates a random array of 16 bytes using the `cryptoObj.getRandomValues` method. It then manipulates certain bytes to ensure that the resulting UUID conforms to the UUID standard. Finally, it returns the UUID in the form of a string.

There are also several third-party libraries that can be used to generate UUIDs in JavaScript like uuid, node-uuid, uuid-js…

These libraries provide a simple API for generating UUIDs and may offer additional features, such as support for different UUID versions or namespaces.

Is it possible to generate a UUID online?

In addition to generating UUIDs in your JavaScript code, you can also generate UUIDs online using various web-based tools. These tools provide a simple interface for generating UUIDs, often allowing you to specify the UUID version and namespace, as well as other options. One of the most popular web-based UUID generator is

We explored the concept of UUIDs, their importance, and where they are used. We then discussed how to generate UUIDs in JavaScript, covering both the built-in crypto API and several third-party libraries. Whether you’re building a database, message queue, or web application, UUIDs provide a reliable way to uniquely identify information in distributed systems.

By using the techniques discussed in this article, you can generate UUIDs in your JavaScript code and ensure that your data is uniquely identified, even in the most complex and distributed systems. As technology continues to evolve, the importance of UUIDs is only likely to increase, so it’s crucial that you have a solid understanding of how to generate them in your JavaScript applications.


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