UUID Generator

Nano ID is quite comparable to UUID v4 (random-based). It has a similar number of random bits in the ID (126 in Nano ID and 122 in UUID), so it has a similar collision probability

These are generated from random (or pseudo-random) numbers. If you just need to generate a UUID, this is probably what you want. The advantage of this version is that when you're debugging and looking at a long list of information matched with UUIDs, it's quicker to spot matches.

This generates a unique ID based on a network card MAC address and current time. If any of these things is sensitive in any way, don't use this. The advantage of this version is that, while looking at a list of UUIDs generated by machines you trust, you can easily know whether many UUIDs got generated by the same machine, or infer some time relationship between them.

The current Unix epoch time