To handle route parameters in React Router v6+, use : in the route path and access them using the useParams() hook.
Define Route with Parameters
<Route path="/user/:id" element={<User />} />
Access Parameters in Component
import { useParams } from "react-router-dom";
function User() {
const { id } = useParams(); // Gets 'id' from URL
return <h2>User ID: {id}</h2>;
}