JavaScript UUID Generator

Generating UUIDs in JavaScript

• crypto.randomUUID() is part of the Web Crypto API. It draws 122 random bits from the platform CSPRNG and returns the canonical 8-4-4-4-12 string, so the value is safe for tokens as well as for database keys. It is available in every current browser and in Node 19 and later.
• What it does not give you is version 7. There is no crypto.randomUUIDV7(): for time-ordered keys you add a package (uuid, or uuidv7) or generate the value here and paste it. Everything else — uppercase, hyphens, braces, batches — is a formatting decision you make at the edges.

How to generate

1. Press Generate UUID above to mint a value in this browser — nothing is sent anywhere.
2. Copy one value with Copy, or set How many and use Copy all for a fixture list.
3. Switch Version if your code needs v7 instead of the v4 default, and turn on Formatting to match your stack's conventions.

Use Cases

• React and framework keys — a stable per-row identifier that survives reordering.
• Idempotency keys on outbound API calls, so a retry is recognised as the same request.
• Test fixtures — request a few dozen at once and paste them into a seed file.

How JavaScript UUID Generator Compares

Code Examples

// Browser and Node 19+
const id = crypto.randomUUID();
// 'f81d4fae-7dec-41d0-a765-00a0c91e6bf6'

// A batch, for fixtures
const ids = Array.from({ length: 25 }, () => crypto.randomUUID());

// Node 16+/14.17, and for a v7 fallback
const { randomUUID, v7: uuidv7 } = require('crypto');
const { v7 } = require('uuid'); // npm install uuid

const v4 = randomUUID();
const timeOrdered = v7();

Frequently Asked Questions

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