CUID2 Generator

CUID2 is a lowercase-letter-and-digit string that starts with a letter, designed with collision resistance and unpredictability in mind. It's become popular recently after ORMs like Prisma adopted it as a default ID generation method.

No. The official @paralleldrive/cuid2 package hashes together a counter, an environment fingerprint, a timestamp, and randomness. This tool matches only the format (a lowercase-alphanumeric string starting with a letter) using cryptographically secure randomness. That's enough for test data or mockups, but use the official library for real production ID issuance.

The CUID2 spec requires the first character to be a letter so the value is always safe to use as a database column name or variable name — some languages and systems don't allow identifiers that start with a digit.

Shorter values raise the collision probability under the same conditions. The default 24 characters is chosen to stay safe even at large scale over a long time, so stick with it unless you have a specific reason to change it.

No. Every value is generated on the spot in your browser and is never sent to or stored on a server.