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UUID Use Case

UUID Anonymous ID

Before login you have no user ID. A UUID anonymous ID lets you record intent and merge it into the real account once they register.

Pre-authMergeablev4

Version

How many

Uppercase Hyphens Braces { }

Result

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

What Is UUID Anonymous ID?

Drop a UUID anonymous ID on first visit; when the user signs up, attach all prior events to the new user ID.
This gives a continuous story from stranger to customer without forcing login upfront.

How to generate

Generate a v4 UUID before auth.
Stamp events with it.
On signup, re-key those events to the user UUID.

Use Cases

Product analytics funnels.
Abandoned-cart recovery.
A/B test assignment.

Code Examples

JavaScript

const id = crypto.randomUUID();

Python

import uuid
id = uuid.uuid4()

Frequently Asked Questions

Keep the anonymous ID after signup?

Typically you migrate its events to the user id, then retire it; some keep it for cross-device stitching.

Is it PII?

No on its own — it is a random handle you later choose to associate with a person.

Related tools

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