About this tool
Generate UUID v4, UUID v7, or monotonic ULID identifiers locally for apps, databases, seeds, and test fixtures, with batches up to 1,000 values.
UUID Generator is useful when development work needs trustworthy random identifiers right away for seeds, fixtures, docs, request IDs, or manual testing. It is faster than opening a REPL or writing a script when the task is simply producing one ID or a clean batch of IDs.
- Uses uuid 14 for UUID v4 and RFC 9562 UUID v7, and ulid 3 for monotonic Crockford Base32 values.
- Checks syntax, UUID version and variant, embedded time, batch duplicates, and applicable lexical ordering before export.
- Generates up to 1,000 identifiers and exports one-per-line, comma-separated, or JSON array output.
How to use UUID Generator
Generate a single UUID or a batch, then copy only the amount you need into your config, test data, or documentation. If you are pairing generation with QA, run the output through the validator or sample it in the target system so you can confirm the expected version and format.
When this tool is useful
- Uses uuid 14 for UUID v4 and RFC 9562 UUID v7, and ulid 3 for monotonic Crockford Base32 values.
- Checks syntax, UUID version and variant, embedded time, batch duplicates, and applicable lexical ordering before export.
- Generates up to 1,000 identifiers and exports one-per-line, comma-separated, or JSON array output.
Examples you can test
Load an example, compare the result with the expected output, then replace it with your own input.
Generate a fixture ID
Example input
Count: 1, version: v4
Expected output
Random UUID v4
Useful for seed data, mock API responses, support examples, and documentation snippets.
Create a batch of test IDs
Example input
Count: 5
Expected output
Five UUID values, one per line
Batch output helps prepare sample rows without manually running a script.
Validation checklist
- Use generated UUIDs for identifiers, not for passwords or secrets.
- Confirm the target system accepts the UUID version and casing.
- Avoid reusing the same sample ID when uniqueness matters.