GUID V4 - Random-Based Identifier (Recommended)
GUID v4 is the most widely used random-based identifier. Learn about its structure, collision probability, advantages and why it is recommended for general-purpose applications.
How to Generate UUIDs in React
Generate UUIDs in React code with browser or runtime APIs for v4 and a package such as uuid for v7, but keep IDs stable outside render.
Important: do not generate random UUIDs for React list keys during render. Keys must be stable across renders.
How to generate UUID v4 in React code
const id = crypto.randomUUID();Generate the value when creating data, not while rendering a list item key.
How to generate UUID v7 in React code
import { v7 as uuidv7 } from 'uuid';
const id = uuidv7();Native support notes
- React does not define its own UUID API.
- UUID v4 often comes from browser crypto support.
- UUID v7 is usually package-based.
- Stable keys matter more than the specific UUID version when rendering lists.
Practical notes
- Generate UUIDs when records are created, fetched, or normalized, not inside JSX mapping expressions.
- Use UUID v7 if your client-generated IDs later benefit from chronological ordering on the backend.
- See the JavaScript guide for runtime details.
Frequently Asked Questions
Yes, but only if the UUIDs are stable and belong to the data itself. Do not generate a new UUID on every render.
Use
crypto.randomUUID() for simple v4 needs in modern browsers. Use a package when you need UUID v7 or consistent behavior across multiple runtimes.Learn more
These articles expand on related concepts, formats and practical considerations.