Q91. Prevent API routes from being accessed by the client?
To prevent API routes from being accessed by the client, you can implement authentication and authorization checks in your API route handlers. This ensures that only auth...
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Q92. JWT Token in Next.js?
JSON Web Tokens (JWT) can be used in Next.js for authentication and authorization. You can create a JWT token upon user login and store it in a cookie or local storage. T...
Q93. How do you handle global styles in the App Router?
By creating a `globals.css` file in the `app` directory and importing it in the `_app.js` file. ```css /* app/globals.css */ body { margin: 0; font-family: -apple-system,...
Q94. How do you use the Edge Runtime for API routes?
You can opt into the Edge Runtime to run API routes on the V8/edge environment. Add `export const runtime = "edge";` at the top of a route handler and use the Web `Reques...
Q95. How do you use placeholders with the next/image component?
Use `placeholder="blur"` with a `blurDataURL` or let Next.js generate it when importing static images. This shows a low-quality blurred preview while the image loads. ```...
Q96. How do you enable ISR (revalidation) in the App Router?
In the App Router you can control revalidation when fetching data by passing the `next` option to `fetch`. For example, to revalidate every 10 seconds: ```js const res = ...
Q97. How should you expose environment variables to the client safely?
Only expose non-sensitive variables by prefixing them with `NEXT_PUBLIC_`. Keep secrets (API keys, DB credentials) server-only in `.env` and access them from server-side ...
Q98. How can you implement simple rate limiting for API routes?
For basic protection you can use an in-memory store (suitable for single-instance apps) or a shared store (Redis) for multiple instances. Example memory-based limiter usi...
Q99. What is the Pages Router in Next.js?
The Pages Router is a file-based routing system in Next.js that automatically creates routes based on the file structure inside the `pages` directory.
Q100. How do you create a route in the Pages Router?
In Next.js pages router, you create routes by adding files to the `pages` directory: - `pages/index.js` - the homepage (/) - `pages/about.js` - the about page (/about) - ...