JavaScript

Dec 16, 2025 · Frontend Development

Why Timestamp+Random Fails and How crypto.randomUUID() Guarantees Truly Unique IDs

This article explains common pitfalls of generating unique IDs with timestamps and simple counters in JavaScript, demonstrates why those methods can collide under high concurrency, and shows how the built‑in crypto.randomUUID() provides a standards‑based, cryptographically secure solution.