What is a UUID?
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit identifier written as 32 hexadecimal digits in five groups, like 3f2b8a1e-9c4d-4e7a-b1f0-6d2e8c9a4b11. Version 4 UUIDs are generated from random numbers, giving 122 random bits — the chance of two ever colliding is negligible.
Common uses
- Primary keys in databases, especially across distributed systems.
- Request, session and transaction IDs in APIs and logs.
- Unique file names and object identifiers.
These UUIDs are created with your browser's cryptographically secure random generator and never leave your device.