generate multiple uuids at once
Generating UUIDs in bulk solves a specific problem: seeding a test table with hundreds of rows, or populating fixtures for a test framework, requires a ready-made list before the code even runs. This page covers the two export formats and the real limits of this tool's bulk generator.
One line per UUID, no separator: the shape a bulk INSERT or a .csv file expects.
The 2-space indentation matches what Jest and Vitest use by default for snapshots, so the file reads cleanly without reformatting.
Math.min caps the value at 1,000 before any UUID is generated, so asking for 5,000 does not error out, it returns exactly the ceiling.
A UUID v4 is a 128-bit unique identifier generated with random bits, except for the 4 version bits and 2 variant bits, which leaves 122 truly random bits. The format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where the version digit is always 4 and y is 8, 9, a or b.
1,000 UUIDs per run, with a minimum of 1. The generator applies Math.min(Math.max(1, count), 1000) to the requested number before starting, so values outside that range are automatically adjusted to the nearest limit, with no error returned.
In practice, no. Each UUID v4 in the batch uses 122 random bits independent of the others, so even across 1,000 generations the odds of two rows matching stay around one in 2^122, the same negligible risk as any pair of UUID v4s generated separately.
For a bulk SQL INSERT or a shell script, the text format (one UUID per line) is the most direct. For seeding test fixtures in JavaScript or TypeScript, the JSON array format comes out ready for a direct import in code.