UUID Use Case

UUID Refresh Token

A refresh token outlives access tokens so users stay logged in. Because it is powerful, it should be a random UUID, stored hashed, and rotated on use.

Long-livedRotate on useStore hashed

Version

How many

Uppercase Hyphens Braces { }

Result

Generated locally with the Web Crypto API — nothing leaves your browser.

What Is UUID Refresh Token?

The refresh token is the crown jewel: with it an attacker can mint access tokens indefinitely, so it must be unguessable (v4) and stored only as a hash.
Rotate it on every use — issue a new UUID and invalidate the old one — so a stolen token stops working after one reuse.

How to generate

Generate a v4 UUID refresh token at login.
Store a hash; return the raw value to the client.
On refresh, verify the hash, then rotate to a new UUID.

Use Cases

Mobile persistent sessions.
SPA silent re-authentication.
Desktop app background auth.

Code Examples

JavaScript

const id = crypto.randomUUID();

Python

import uuid
id = uuid.uuid4()

Frequently Asked Questions

Why rotate refresh tokens?

Rotation means a leaked token is useless after the next legitimate refresh, limiting the window of abuse.

Where to store it client-side?

HttpOnly cookie for web; secure device storage for mobile. Never local-storage it in a browser.

Related tools

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