Crypto

`crypto.randomUUID`

Returns a newly generated, version 4 UUID string in the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

Syntax

JavaScript

crypto.randomUUID()

Return Value

A string containing a randomly generated 36-character UUID v4

Examples

Basic Usage

const id = crypto.randomUUID()
console.log(id) // e.g. '550e8400-e29b-41d4-a716-446655440000'

Practical Example

const items = Array.from({ length: 5 }, () => ({
  id: crypto.randomUUID(),
  createdAt: Date.now()
}))
console.log(items)

Advanced Usage

function createRecord(name: string) {
  return {
    id: crypto.randomUUID(),
    name,
    timestamp: new Date().toISOString()
  }
}

Understanding crypto.randomUUID

The crypto.randomUUID method in JavaScript returns a newly generated, version 4 UUID string in the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. It belongs to the Crypto object and is one of the most widely used methods for working with crypto values in modern JavaScript and TypeScript applications.

The method signature is crypto.randomUUID(). When called, it returns a string containing a randomly generated 36-character uuid v4. Understanding when and how to use randomUUID() helps you write more expressive, readable code.

Common use cases for crypto.randomUUID include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like crypto-getrandomvalues, math-random, enabling you to chain operations together for complex data manipulation pipelines.

Supported in Chrome 92+, Firefox 95+, Safari 15.4+, Edge 92+, and Node.js 19+. Requires a secure context (HTTPS).