UUID Generator

A UUID generator creates a 128-bit identifier represented in a standard hexadecimal format. Version 4 UUIDs are random identifiers with fixed version and variant bits, making collisions extremely unlikely when a proper cryptographic random source is used. They are useful for test fixtures, correlation IDs, database records, and client-generated request identifiers, but a UUID does not automatically provide ordering, secrecy, or authorization.

Generate identifiers with the platform's cryptographically secure random API rather than a predictable counter or a weak pseudo-random function. Validate the version and variant when a downstream system requires UUID v4 specifically. Never use a UUID as a password, bearer token, or capability without considering guessing and enumeration risks. For database keys, choose the storage type and indexing strategy intentionally because random inserts can affect locality.

A development utility should not need to transmit every identifier to a remote service. Local generation is instant, works offline, and keeps fixture data out of analytics and request logs. It is ideal for creating sample IDs, but production systems should still assign or validate identity at the trust boundary. If an ID needs to be sortable, traceable, or scoped to a tenant, pair it with an explicit timestamp or server-side policy rather than assuming UUID v4 carries those properties.