Developer / 4 min read
What Is a UUID Used For?
A plain-English guide to UUIDs, random identifiers, mock data, test records, and when unique IDs are useful.
UUIDs are unique-looking identifiers
A UUID is a long identifier commonly used for records, test data, prototypes, and distributed systems. It is designed to avoid collisions without needing a simple counting sequence.
Developers often use UUIDs when creating mock records, database examples, local test objects, or request IDs.
When a UUID is useful
A UUID is helpful when you need an ID that does not reveal how many records exist and does not depend on one central counter.
- Mock data and prototypes.
- Database records and public IDs.
- Request tracing and logs.
- Temporary test records.
UUIDs are not passwords
A UUID can be hard to guess, but it is not a replacement for a password, secret token, or permission system. Use the right security tool for sensitive access control.