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UUID Use Case

UUID Magic Link

A magic link is a one-click login. The embedded UUID token is a bearer credential, so it must be single-use and expiring.

PasswordlessSingle-usev4

Version

How many

Uppercase Hyphens Braces { }

Result

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

What Is UUID Magic Link?

The magic link token is a v4 UUID mailed to the user; clicking it proves possession of the inbox and logs them in.
Hash it, expire it (minutes), and consume it on first use.

How to generate

Generate a v4 UUID on click.
Email a /login/ link; store hashed + expiring.
On visit, verify, start a session, delete the token.

Use Cases

Passwordless auth.
Low-friction sign-in.
Second-factor fallback.

Code Examples

JavaScript

const id = crypto.randomUUID();

Python

import uuid
id = uuid.uuid4()

Frequently Asked Questions

Magic link vs password?

Magic links avoid password storage but depend on email security; offer both.

How long should it live?

Minutes — long enough to check email, short enough to limit interception.

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