__UUID

Also documented in context in the full Functions and Variables reference.

TL;DR: __UUID returns a random RFC 4122 UUID (v4) — the standard choice for a genuinely unique identifier per request (idempotency keys, correlation IDs, unique record creation) where a sequential counter would collide across parallel test runs.

The UUID function returns a pseudo random type 4 Universally Unique IDentifier (UUID).

Examples:

\${__UUID()}

will return UUIDs with this format : c69e0dd1-ac6b-4f2b-8d59-5d4e8743eecd

Example

${__UUID()}   → e.g. 8f14e45f-ceea-467e-b7d1-9d1946a4c8b1

Common use: an Idempotency-Key header on a payment/order-creation HTTP Request, or a unique record name so repeated test runs don’t collide on a unique-constraint. For sequential (not random) unique values, see __counter.

Related

• Functions and Variables Guide
• Regex Extractor Builder
• Correlation & Dynamic Values
• Full Functions Reference
• Component Reference