UUID Use Case
UUID Request ID
A request ID travels with a request from the edge to every downstream service, turning scattered logs into one traceable story.
Cross-serviceLog correlationv4
Generated locally with the Web Crypto API — nothing leaves your browser.
What Is UUID Request ID?
- Assign a v4 UUID at the entry point and propagate it via a header (e.g. X-Request-ID) to every internal call.
- Structured logs then include the ID, so you can grep one value and see the whole journey.
How to generate
- Generate a UUID in middleware on each request.
- Put it in a response header and a logging context.
- Forward it on outbound calls.
Use Cases
- Microservices debugging.
- Support ticket investigation.
- Audit trails.
Code Examples
JavaScript
const reqId = crypto.randomUUID();
res.setHeader('X-Request-ID', reqId);
logger.info({ reqId, path }, 'handled');Frequently Asked Questions
Generate per request or reuse?
One fresh UUID per request; reuse it only when one logical operation spans several requests.
Does it leak user data?
No — it is random and carries no payload.
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