Q81. What are the differences between page router and app router in nextjs?
Next.js provides two different routing systems: the **Page Router** (traditional) and the **App Router** (introduced in Next.js 13). The App Router is built on React Serv...
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Q82. What is the difference between BrowserRouter, HashRouter, and MemoryRouter?
All three are drop-in `` implementations from `react-router-dom` (see [What are the `` components of React Router v6?](#what-are-the-router-components-of-react-router-v6)...
Q83. What are dynamic routes and what are route parameters?
A **dynamic route** is a route path that contains a placeholder segment (a *route parameter*) instead of a fixed, hard-coded value, so a single route definition can match...
Q84. How do you navigate programmatically in React Router?
In React Router v6+, programmatic navigation (redirecting from code rather than a user clicking a link) is done with the **`useNavigate`** hook, which replaces the old `h...
Q85. How do you implement protected/private routes?
A protected (or private) route only renders its content when the user meets some condition (usually "is authenticated"), otherwise it redirects them elsewhere (e.g., to `...
Q86. How do you handle 404 / Not Found routes?
React Router matches routes top-to-bottom/most-specific-first, so a catch-all route with `path="*"` placed last will match any URL that didn't match an earlier route — th...
Q87. What are loaders, actions, and data APIs in modern React Router?
Starting with React Router v6.4, the library ships **data APIs** (`createBrowserRouter`, `loader`, `action`, `useLoaderData`, `useActionData`, `useFetcher`) that move dat...