About UUID Generator
UUID Generator creates UUID v1, v4, or v7 identifiers in the browser, with batch generation for fixtures and development data.
The version controls properties such as randomness, time ordering, and information exposure. Choose based on how identifiers are stored and compared rather than assuming every UUID version has the same database or privacy behavior.
How to use this developer tool
- Choose the UUID version and quantity.
- Generate the identifiers and check their format before using them in a fixture or request.
- Record the version and any ordering assumptions with the code that consumes the identifiers.
Privacy and data handling
UUID generation is local and does not require input data. Version 1 can expose time and node-related information, so use a version whose disclosure and ordering characteristics fit the application.
Related developer tools
Frequently asked questions
When should I use UUID v4?
UUID v4 is a common default for random identifiers when you do not need creation-time ordering and do not want the identifier to expose time-related information.
Why use UUID v7?
UUID v7 includes a time component and is designed to sort by creation time while retaining a random component, which can help some database and event workloads.
Does a UUID guarantee uniqueness?
It makes collisions unlikely within its intended space, but an application still needs proper constraints and a clear policy for retries and imports.