Generate Test IDs for Software Testing
Create batches of unique IDs for test fixtures, mock data, and automated test suites.
Click Generate to create UUIDs
UUID v4 uses 122 random bits — the chance of a collision between two UUIDs is astronomically small.
Generated with crypto.getRandomValues — cryptographically secure, never sent to a server.
Testing tips
Test fixtures need stable but unique IDs. Generate a batch of 50 UUIDs here, then hardcode them in your fixture files for reproducible tests.
Unit tests that generate their own UUIDs at runtime can produce flaky comparisons. Pre-generate and hardcode IDs to make assertions deterministic.
For E2E tests, use pre-generated UUIDs as known entity identifiers. This avoids race conditions where the test creates an entity and immediately queries it.
Copy 10 UUIDs at once and paste them into a JSON fixture file or seed script. The "Copy all" button joins them with newlines for easy parsing.
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