JavaScript

Oct 6, 2025 · Frontend Development

Why Timestamp+Random Fails and How to Generate Truly Unique IDs in JavaScript

Generating unique IDs may seem trivial, but common approaches like combining Date.now() with Math.random() or using a simple counter suffer from timestamp precision limits and non‑cryptographic randomness, whereas the modern, standards‑based crypto.randomUUID() provides collision‑free, cryptographically secure identifiers across browsers and Node.js.