Q351. How do you persist Redux state?
**`redux-persist`** is the standard library for persisting and rehydrating a Redux store across page reloads/app restarts. It wraps your root reducer so selected slices a...
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Q352. How do you debug a Redux performance problem?
A practical, step-by-step approach: 1. **Confirm it's actually Redux**: use the React DevTools **Profiler** to see which components re-render and how often, before assumi...
Q353. What should be stored in Redux vs derived with selectors?
A common mistake is storing **computed/derived values** in Redux state itself, which then has to be kept in sync manually every time the source data changes. The rule of ...
Q354. Would you put all API data into Redux?
**No** — not by default. Server data (see [client state vs server state](#what-is-the-difference-between-client-state-and-server-state)) has different needs than plain cl...
Q355. 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)...
Q356. 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...
Q357. 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...
Q358. What is the difference between Link, NavLink, and `<a>`?
All three render an anchor tag in the DOM, but they behave very differently when clicked: | Aspect | `` | `` | `` | | --- | --- | --- | --- | | Navigation | Full page rel...
Q359. 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 `...
Q360. 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...