How do I generate a UUID in JavaScript?

In modern browsers, use crypto.randomUUID() to generate a v4 UUID. For Node.js (v15.6+), use const { randomUUID } = require('crypto'); randomUUID();

What's the difference between UUID v4 and v7?

UUID v4 is completely random, while UUID v7 includes a timestamp component, making it sortable by creation time. v7 is better for database indexes and ordered data.

Is crypto.randomUUID() secure?

Yes, crypto.randomUUID() uses cryptographically secure random number generation, making it suitable for security-sensitive applications.

JavaScript UUID Generator (v4, v7 & more)

Instantly generate fast, secure, and unique UUIDs online. Get ready-to-use code for browser (crypto) and Node.js, with or without libraries.

Try Generator View Code & Guide

UUID Version

Quantity

How to Use This Tool

Select the UUID version (v4, v7) and desired quantity.
Click "Generate" to instantly create your UUIDs.
Copy a single UUID by clicking on it, or use the "Copy All" / "Export" buttons.
Scroll down to the guide for detailed JavaScript code examples for any scenario.

Common Use Cases

Unique Identifiers

Generate unique IDs for database records, files, or objects without central coordination.

Session & Token Management

Create secure session IDs, API tokens, and temporary credentials with guaranteed uniqueness.

Database Primary Keys

Use UUIDs as primary keys in distributed databases for better scalability and data merging.

The Ultimate Guide to Generating UUIDs in JavaScript & Node.js

Browser (Native)

// Generate a v4 UUID using the browser's built-in Crypto API.
// This is the fastest, most secure, and recommended method for modern browsers.
const uuid = crypto.randomUUID();
console.log(uuid); 
// Example output: "3a67d93a-2j31-4b8c-9c8a-3d23c8a9b12a"

Quick Tips:

• Use crypto.randomUUID() for v4 UUIDs in modern browsers
• Use UUID v7 for sortable, timestamp-based identifiers
• Install the uuid library for advanced features
• Always validate UUID format when accepting user input

Frequently Asked Questions

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