How to Generate a GUID/UUID in JavaScript


By squashlabs, Last Updated: May 3, 2024

How to Generate a GUID/UUID in JavaScript

To generate a GUID/UUID (Globally Unique Identifier/Universally Unique Identifier) in JavaScript, you can use the following approaches:

Approach 1: Using the uuid Package

One of the easiest ways to generate a GUID/UUID in JavaScript is by using the uuid package. This package provides a simple and efficient API for generating universally unique identifiers.

To use the uuid package, you need to install it first. Open your terminal or command prompt and run the following command:

npm install uuid

Once the package is installed, you can generate a GUID/UUID by importing the v4 function from the uuid package and calling it. Here’s an example:

const { v4: uuidv4 } = require('uuid');

const guid = uuidv4();

This code will generate a new GUID/UUID and log it to the console.

Related Article: Accessing Parent State from Child Components in Next.js

Approach 2: Using the crypto API

If you prefer not to use a third-party package, you can also generate a GUID/UUID using the crypto API available in modern browsers and Node.js.

Here’s an example of how you can generate a GUID/UUID using the crypto API in Node.js:

const crypto = require('crypto');

function generateGuid() {
  return crypto.randomBytes(16).toString('hex');

const guid = generateGuid();

In this code, we use the crypto.randomBytes() function to generate a buffer of random bytes. We then convert the buffer to a hexadecimal string using the toString('hex') method.

Best Practices

When generating GUIDs/UUIDs in JavaScript, it’s important to follow some best practices to ensure uniqueness and randomness:

1. Use a reliable method: Instead of implementing your own GUID/UUID generation algorithm, it’s recommended to use established libraries or built-in APIs that have been thoroughly tested and proven to be reliable.

2. Use a version 4 UUID: Version 4 UUIDs are randomly generated and have a very low probability of collisions. They are suitable for most use cases and don’t require any additional information or context.

3. Avoid using sequential or time-based UUIDs: Sequential or time-based UUIDs may leak information about the time or order of creation, which might not be desirable in certain scenarios.

4. Consider the security requirements: If your application requires secure GUID/UUID generation, make sure to use a cryptographically secure random number generator, such as the one provided by the crypto API.

5. Keep the GUID/UUID generation code separate: It’s a good practice to encapsulate the GUID/UUID generation logic in a separate function or module, making it easier to maintain and test.

Alternative Ideas

Apart from the approaches mentioned above, there are other libraries and techniques available for generating GUIDs/UUIDs in JavaScript. Some popular alternatives include:

nanoid: A tiny, secure, and URL-friendly UUID generation library. It generates unique IDs with a customizable length and can be used both in the browser and Node.js. You can find more information and examples in the [nanoid documentation](

– Custom implementation: If you have specific requirements or constraints, you can also implement your own GUID/UUID generation algorithm. However, this approach requires a deep understanding of the underlying concepts and careful consideration of the uniqueness and randomness factors.

Related Article: How to Apply Ngstyle Conditions in Angular

You May Also Like

Utilizing Debugger Inside GetInitialProps in Next.js

Learn how to use a debugger within the getInitialProps function in Next.js. Discover debugging techniques, essential tools, best practices, and helpful tips for... read more

Using the JavaScript Fetch API for Data Retrieval

The JavaScript Fetch API is a powerful tool for efficiently retrieving data from a server. From fetching data to handling errors, this article covers all the essential... read more

Understanding JavaScript Execution Context and Hoisting

The article: Gain a clear understanding of how JavaScript execution context and hoisting work within the language. Explore key concepts such as global and local... read more

Tutorial: Role of JavaScript in AJAX Technology

JavaScript is a crucial component of AJAX technology, enabling dynamic web interactions. This article explores the role of JavaScript in AJAX, examining the... read more

Top Algorithms Implemented in JavaScript

JavaScript algorithms are essential tools for software engineers looking to optimize their code. In this guide, we will explore the implementation and usage of various... read more

The Most Common JavaScript Errors and How to Fix Them

Handling errors in JavaScript can be a challenging task for developers. From common syntax errors to scope issues and asynchronous errors, this article covers a wide... read more