What is UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are standardized by the Open Software Foundation (OSF).
UUID v4 Format
UUID v4 uses random numbers and follows this format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is any hexadecimal digit and y is one of 8, 9, A, or B.
Common Uses
- Database primary keys
- Session identifiers
- Transaction IDs
- File identifiers
- API tokens