Generate a fresh UUID v4 locally when you need an identifier for test records, database rows, API examples, event payloads, fixtures, or configuration files.
What UUID v4 means
A UUID v4 is a 128-bit identifier with fixed version and variant bits. The remaining 122 bits come from random data, so it does not reveal creation time, machine information, or a sequence counter.
When to use it
Use UUID v4 for client-generated IDs, mock objects, temporary records, public examples, and distributed systems where sort order is not important.
Privacy and reliability
Generation uses Web Crypto in this browser tab. The value is not sent to a server; copy it when ready and regenerate whenever you need another identifier.