How do I generate a UUID in JavaScript?

In modern browsers, use crypto.randomUUID() for UUID v4. In Node.js, you can use randomUUID from the crypto module. For sortable identifiers, use a UUID v7 implementation.

What is the difference between UUID v4 and v7?

UUID v4 is random. UUID v7 includes a timestamp component, so it sorts better by creation time and is often friendlier for database indexes.

Is crypto.randomUUID() secure?

Yes. crypto.randomUUID() uses a cryptographically secure source of randomness and is suitable for security-sensitive identifiers in modern environments.

JavaScript UUID Generator Online

Generate UUID v4 or v7, copy one or many results, and switch between browser-native and Node.js code examples without leaving the page.

Generate UUIDs now View browser and Node.js code

UUID v4

Best default for random identifiers in browsers and Node.js.

UUID v7

Better when you want identifiers that sort by creation time.

Batch output

Generate, copy, and export multiple UUIDs in one pass.

UUID Version

Quantity

How to use this UUID generator

Select the UUID version you need and how many values to generate.
Generate a fresh batch instantly in the browser.
Copy one UUID by clicking it, or use the batch copy and export buttons.
Use the code tabs below for browser-native, Node.js, React, validation, or UUID v7 examples.

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 UUID v4 in modern browsers.
Use UUID v7 when sort order by creation time matters.
Use the uuid package when you need multiple versions or namespace-based UUIDs.
Validate UUID format when accepting user input from outside your own system.

Frequently Asked Questions

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