Generate single or bulk cryptographically secure v4 UUIDs for PostgreSQL primary keys, test fixtures, and distributed system microservices.
Sequential auto-incrementing database IDs (1, 2, 3...) leak sensitive business metrics to competitors and expose endpoints to enumeration attacks. Universally Unique Identifiers (UUID v4) generate 128-bit numbers with mathematically negligible collision probability (less than one in billions), enabling distributed microservices and mobile apps to generate database keys offline.
Populate id columns with standard 36-character identifiers that prevent key collision across distributed shards.
Generate hundreds of realistic unique IDs for unit tests, seeders, and front-end state management.
Create unguessable session IDs, payment transaction references, and idempotency keys.
Attach a unique correlation ID to every incoming API request to trace logs across microservice fleets.
UUID (Universally Unique Identifier) is the open IETF RFC-4122 standard term, while GUID (Globally Unique Identifier) is Microsoft's implementation. They are practically synonymous.
The total number of possible UUID v4 values is 2^122 (approx 5.3 x 10^36). The probability of a collision is so infinitesimally tiny that it is considered mathematically zero.
Yes, we use the browser's native `crypto.getRandomValues()` CSPRNG (cryptographically secure pseudo-random number generator).
Yes, you can generate up to 100 UUIDs simultaneously and copy them as a newline-separated list.