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UUID Use Case

UUID Correlation ID

Where a request ID is per-HTTP-call, a correlation ID spans a whole workflow — including async jobs triggered later.

Cross-eventAsync-friendlyv4

Version

How many

Uppercase Hyphens Braces { }

Result

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

What Is UUID Correlation ID?

A correlation ID is created when a flow starts (an order, a signup) and stamped onto every side effect: emails, queue messages, DB rows.
It survives beyond the original request, so background workers can be traced back to the triggering event.

How to generate

Create one UUID when the flow begins.
Thread it through queues and workers.
Include it in every log and stored record of that flow.

Use Cases

Order fulfilment across services.
Signup welcome + verification chain.
Data pipelines triggered by one event.

Code Examples

JavaScript

const id = crypto.randomUUID();

Python

import uuid
id = uuid.uuid4()

Frequently Asked Questions

Correlation vs request ID?

Request ID is per call; correlation ID is per business flow and outlives the call, covering async work.

Should it be a UUID?

A v4 UUID is ideal — unique, unordered, and collision-free across services.

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