Generate UUIDs in JavaScript

// Modern browsers and Node.js 15.6+ (native API)
const uuid = crypto.randomUUID();
console.log(uuid);  // Example: 3d6f9e64-7d8a-4c3e-8f2b-1a4e5c6d7e8f

// Using uuid npm package (install: npm install uuid)
import { v4 as uuidv4, v5 as uuidv5, v7 as uuidv7 } from 'uuid';

// UUID v4 (random)
const uuid4 = uuidv4();
console.log(uuid4);  // Example: 3d6f9e64-7d8a-4c3e-8f2b-1a4e5c6d7e8f

// UUID v7 (timestamp-ordered)
const uuid7 = uuidv7();
console.log(uuid7);  // Example: 018e5e1a-7b2c-7d4f-9a3e-8c7f6e5d4c3b

// UUID v5 (namespaced)
const NAMESPACE = '6ba7b810-9dad-11d1-80b4-00c04fd430c8'; // DNS namespace
const name = 'example.com';
const uuid5 = uuidv5(name, NAMESPACE);
console.log(uuid5);  // Always same: cfbff0d1-9375-5685-968c-48ce8b15ae17

// Validate UUID
import { validate, version } from 'uuid';
if (validate(uuid4)) {
    console.log('Version:', version(uuid4));  // Outputs: 4
}