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UUID v4 uses 122 random bits (6 bits are fixed for version/variant). Generated using a cryptographically secure random number generator (CSPRNG). Probability of collision is astronomically low.
Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx; where x is random hex, 4 marks version, y is 8/9/a/b (variant 1)With 122 random bits, you need to generate approximately 2.71 quintillion (2.71×10^18) UUIDs to have a 50% chance of collision. For practical purposes, collisions are considered impossible.
Updated: July 2026
Create a batch of 100 unique identifiers for test data population.
→ 100 unique v4 UUIDs like a1b2c3d4-e5f6-4a7b-8c9d-0e1f2a3b4c5d
Create UUIDs in compact hex format for systems that don't need the hyphenated display.
→ 10 UUIDs like a1b2c3d4e5f64a7b8c9d0e1f2a3b4c5d (32 hex chars)
Math.random() is not cryptographically secure and may produce predictable sequences. Always use crypto.getRandomValues() (browser) or crypto.randomUUID() for UUID generation.
UUID v4 is purely random with no ordering guarantee. If you need time-sortable IDs, use UUID v7 (timestamp + random) or ULID instead.
Generate multiple UUID v4 identifiers at once. Create batches of RFC 4122 random UUIDs for database seeding, testing, and distributed system prototyping. It applies the uuid v4 generation (Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx; where x is random hex, 4 marks version, y is 8/9/a/b (variant 1)). For example: generate 100 uuids for database seeding — Create a batch of 100 unique identifiers for test data population.