How do I generate a UUID in JavaScript?

Use crypto.randomUUID() — it's built into all modern browsers and Node.js 19+. No library needed. It generates a cryptographically random UUID v4.

Is crypto.randomUUID() safe for production?

Yes. It uses the same cryptographic random number generator as the Web Crypto API. The generated UUIDs have 122 bits of randomness, making collisions practically impossible.

Should I use UUID v4 or v7?

Use v4 for general-purpose identifiers. Use v7 for database primary keys — its timestamp prefix makes inserts sequential, which significantly improves database index performance.

How to Generate a UUID in JavaScript

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