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UUID Generator

Generate cryptographically random version 4 UUIDs in bulk.

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What is UUID Generator?

UUID Generator creates version 4 universally unique identifiers using the browser's cryptographic random number generator. A v4 UUID is a 128-bit value written as 36 characters and is used as a primary key, correlation ID or file name when identifiers must be unique without a central allocator.

How to use it

  1. 1Set how many identifiers you need.
  2. 2Choose casing and whether to wrap each value in braces.
  3. 3Generate — one UUID per line.
  4. 4Copy them into your fixture, migration or test data.

Features

  • Uses crypto.randomUUID or crypto.getRandomValues, never Math.random
  • Bulk generation up to 500 at a time
  • Uppercase and brace-wrapped formats for platforms that expect them

When people use it

Seeding test data

Fixtures need stable-looking but unique keys. Generating a batch is faster than inventing them by hand and avoids accidental collisions.

Correlating logs across services

Attaching a UUID to a request lets you trace it through every service that handled it.

Known limits

  • v4 UUIDs are random, so they do not sort chronologically. If you need time-ordered keys, consider UUID v7 or a ULID.

UUID Generator questions

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Last reviewed 2026-08-03. Browse the full directory.