Best Ways to Create GUID/UUID in JavaScript

A GUID (Globally Unique Identifier) or UUID (Universally Unique Identifier) is a 128-bit value used to uniquely identify objects. JavaScript provides multiple ways to generate UUIDs, with the recommended method being crypto.randomUUID().

1. Using crypto.randomUUID() (Recommended)

This built-in method generates a UUID v4, ensuring randomness and uniqueness. It is supported in modern browsers and Node.js (14.17+).

2. Using crypto.getRandomValues() (Alternative Secure Method)

If you need a secure UUID v4 generator without crypto.randomUUID(), use the following function:

This method uses crypto.getRandomValues() to ensure better randomness and security compared to Math.random().

3. Using Math.random() (Fallback)

If crypto APIs are unavailable, you can use Math.random() as a fallback:

This method is not cryptographically secure and should only be used when better alternatives are unavailable.

Conclusion

Generating a UUID in JavaScript is straightforward with multiple options available. The recommended method is crypto.randomUUID() for modern browsers and Node.js. If not available, crypto.getRandomValues() offers a secure alternative. As a last resort, Math.random() can generate UUID-like values but lacks cryptographic security. Always choose the most secure method available for your use case.