UUID Generator

About UUID Generator

UUID Generator creates RFC-style version 4 identifiers for test records, fixtures, correlation IDs, and temporary object identifiers.

Common uses

• Generate ten IDs for seed data.
• Create a single ID for a mock API object.
• Copy a batch of identifiers for database migration tests.

Good to know

UUID v4 values are random identifiers. They are not sequential and should not be used when sortable IDs are required.

When UUIDs fit

UUID v4 values are useful for fixtures, correlation IDs, temporary object IDs, and cases where independent systems need a low-collision identifier without coordinating a counter.

Batch generation

Generate a batch when preparing seed data or examples, then review whether the receiving system expects lowercase text, braces, hyphenless values, or a database-native UUID type.

Common mistakes

Random UUIDs are not sortable by creation time. Use a timestamp-aware ID strategy when ordering by creation sequence matters.

Worked example: Creating an identifier for a test fixture

Generate one UUID v4

Example shape: 9b2f6c80-1f34-4f79-8b42-7ec8fb1cb5ab

Version 4 UUIDs use random or pseudorandom bits and have a recognizable version and variant layout. Your generated value will intentionally differ from this example.

Technical reference

The behavior described on this page was reviewed against RFC 9562: Universally Unique IDentifiers. External standards remain authoritative when their requirements differ from a browser implementation.

Before you rely on the output

• Generated values are intended for tests, prototypes, documentation, and controlled workflows; review them before using them in external systems.
• Privacy mode: inputs are processed locally in your browser and are not intentionally sent to an application server.