Skip to contentUUIDs are 128-bit identifiers used for database keys, API ids and session tokens — often formatted as v4 random strings.
A UUID (Universally Unique Identifier) is a 128-bit value, usually shown as 36 characters with hyphens (e.g. 550e8400-e29b-41d4-a716-446655440000). Version 4 UUIDs use random bits from a cryptographically secure source — suitable for primary keys and correlation ids.
Collisions are astronomically unlikely for practical systems. Tentaco UUID Generator creates v4 ids locally with crypto.getRandomValues — nothing is sent to a server.
