Question stringlengths 54 236 | Response stringlengths 2 763 |
|---|---|
In a Next.js form using the `<input type="file">`, what is submitted to the server when the action is a string? | The filename |
What component in Next.js optimizes images for performance by lazy loading and automatic resizing? | Image Component |
What property can be used to create a video sitemap according to the provided reference? | videos |
What method can be used in Next.js for route segments to display a loading state and prevent blocking during data requests? | loading.js |
What is a potential drawback of using `getImageProps()` with the `placeholder` prop in Next.js? | The placeholder will never be removed. |
What is the minimum Node.js version required for upgrading to Next.js version 13? | v18.17 |
What potential risk does allowing production builds to complete even if there are ESLint or TypeScript errors pose for a Next.js application? | Faulty deploys due to unresolved type errors or linting issues. |
What is the requirement for a root layout in the app directory of a Next.js project, and how does it impact page rendering? | A root layout in the app directory is required to contain `html` and `body` tags. It impacts page rendering by preserving state, maintaining interactivity, and preventing rerender on navigation. |
What is the method used in Next.js to revalidate data after a specified period or on-demand in version 15? | ISR (Incremental Static Regeneration) |
How can you selectively disable Partial Prerendering for child segments in Next.js version 15? | Set `experimental_ppr` to `false` in the child segment. |
What Next.js middleware flag introduced in version 13.1 allows maintaining URL trailing slashes for specific paths? | skipTrailingSlashRedirect |
What is the recommended testing approach for async Server Components in React, given current tool limitations according to the latest Next.js documentation? | End-to-End Testing |
What does the `onError` property in Next.js `next/script` components do, and under which conditions can it not be used? | The `onError` property in Next.js `next/script` components is used to handle errors when a script fails to load. It cannot be used with the `beforeInteractive` loading strategy and can only be used in Client Components, not Server Components. |
How can you configure the metadata for an image's width and height in Next.js Route Handlers for the `opengraph-image` route? | ```typescript
export const size = { width: 1200, height: 630 }
``` |
What React API is recommended to prevent sensitive session data from being exposed to the client in Next.js? | taintUniqueValue |
What Node.js version is required at a minimum after upgrading to Next.js version 14? | 18.17 |
What recommended feature in Next.js version 15 replaced the deprecated `unstable_noStore` for opting out of static rendering? | `connection` |
What function is responsible for hashing a user's password prior to its storage in the database? | bcrypt.hash |
What configuration option must be enabled in Next.js to use the `unauthorized` function for handling authorization errors? | authInterrupts |
What is the function used to parse and validate the form fields before processing in a signup action? | `SignupFormSchema.safeParse` |
What file prevents a `route.js` from existing at the same route in a Next.js application? | page.js |
What option in Next.js version 13 controls the maximum memory usage of turbotrace? | memoryLimit |
How can you read headers within a Route Handler in Next.js, and what must you do if you want to set headers? | Read headers using `headers` from `next/headers`; set headers by returning a new `Response` with new `headers`. |
What is the default state of the `logDetail` option for turbotrace in Next.js? | false |
What function is used to define dynamic metadata based on route parameters in Next.js (Vercel Managed) Server Components? | generateMetadata |
How would a Next.js application behave if the `quality` prop of an image does not match any of the specified values in the `qualities` configuration? | 400 Bad Request |
What type of metadata should be defined using a `Metadata` object instead of the `generateMetadata` function in Next.js Server Components? | Static metadata |
What version introduced the async nature of the cookies function in Next.js? | v15.0.0-RC |
What is the effect of setting the `maxAge` attribute of a cookie to 0 in the context of Next.js version 15.0.0-RC? | It immediately expires the cookie. |
What major change regarding React Server Components poses a challenge for security teams in Next.js? | React Server Components in App Router. |
How do error boundaries in Next.js handle uncaught exceptions in client components? | Error boundaries in Next.js catch errors in their child components and display a fallback UI, handling uncaught exceptions in client components. |
What configuration is required in the Next.js `next.config.js` file to safely use images hosted on a remote AWS S3 bucket? | ```
images: {
remotePatterns: [
{
protocol: 'https',
hostname: 's3.amazonaws.com',
pathname: '/my-bucket/**',
},
],
}
``` |
What is a restriction when calling the `forbidden` function in Next.js version v15.1.0? | The `forbidden` function cannot be called in the root layout. |
What is the purpose of using the `useActionState` hook in a Next.js + TypeScript signup form? | To manage form state, handle submission, and display messages. |
How does the `loading.js` file in Next.js (version 13) enhance the user experience during navigation? | The `loading.js` file in Next.js (version 13) enhances user experience by providing an instant loading state with React Suspense, ensuring that users see a meaningful UI immediately while content loads, making navigation feel faster and more responsive. |
What is one limitation of using dynamic data like headers or cookies within Next.js' `unstable_cache` function as per the current version 14.0.0? | Accessing dynamic data sources such as headers or cookies inside a cache scope is not supported. |
In Next.js, how can a regex path be used to match a URL segment composed only of digits, and what is the syntax to escape special characters in a static string within the path? | To match a URL segment composed only of digits, use `/path/:segment(\d+)`. To escape special characters, use `\\` before them, e.g., `/path/special\\(value\\)`. |
Which Next.js function introduced in version v15.1.0 can be used to restrict access to routes based on user roles? | forbidden |
What effect does setting `dynamic = 'error'` have on the default value of `dynamicParams` in Next.js? | `false` |
What is the purpose of creating a `[[...slug]]` directory in a Next.js application? | To create an optional catch-all route segment. |
What change is required in the `runtime` configuration to avoid errors when using an outdated method in Next.js? | edge |
What HTTP status code does Next.js return when the `forbidden` function is invoked during authentication? | 403 |
What is the default value of the `dynamic` option in Next.js when the `dynamicIO` flag is off? | `'auto'` |
What version of Next.js is recommended for handling and applying nonces correctly? | v13.4.20+ |
What configuration option can be used to cache `GET` methods in Route Handlers in the latest Next.js version? | export const dynamic = 'force-static' |
What is a key difference in behavior between templates and layouts when navigating between pages in Next.js v13.0.0? | Templates create a new instance and re-synchronize effects on each navigation, unlike layouts where state is preserved. |
Which version of Next.js introduced the experimental `forbidden.js` feature? | v15.1.0 |
In Next.js, what is the purpose of the Full Route Cache on the server? | Reduce rendering cost and improve performance. |
What function in Next.js version 13.3.0 was introduced to generate metadata for image responses? | generateImageMetadata |
What is the purpose of the `generateMetadata` function in Next.js Server Components? | To fetch metadata that requires dynamic values. |
What configuration file is used to specify the plugins and environment for testing with Vitest in a Next.js project using TypeScript? | vitest.config.mts |
What command is used to manually execute Vitest tests according to the specified setup in a Next.js project configured with Vitest? | npm run test |
What file must be used to define MDX Components in a Next.js project running version v13.1.2? | mdx-components.tsx |
What is the purpose of using the `@next/bundle-analyzer` plugin in Next.js applications? | Analyze the size of JavaScript bundles. |
What is the default status code used by the `redirect()` method in Next.js version 13.0.0, and why? | 307 |
What is the role of the `useMDXComponents` function in managing MDX Components in Next.js version v13.1.2? | The `useMDXComponents` function manages MDX component overrides by accepting and returning an `MDXComponents` instance, allowing custom components to replace default HTML elements in MDX content. |
What does setting the `replace` prop to `true` do in a Next.js `Link` component? | Replaces the current history state instead of adding a new URL into the browser's history stack. |
What is the purpose of using a `font definitions file` when working with fonts in a Next.js application? | Centralize font loading and reuse across the application. |
What ReactDOM method would you use in Next.js to start loading a resource early in the page rendering lifecycle, and what is the expected element in the head output? | ReactDOM.preload
```html
<link rel="preload" href="..." as="..." />
``` |
What strategy in Next.js allows a third-party script to be offloaded to a web worker, and is currently experimental according to the latest version? | worker |
In Next.js, under what circumstances will navigation using the `<Link>` component trigger the `onClick` event but not the `onNavigate` event? | - When using modifier keys (e.g., Ctrl/Cmd + Click).
- When navigating to external URLs.
- Links with the `download` attribute. |
How does one apply the `Inter` font using the CSS Variables method in a Next.js app? | Import the font and CSS file, set the variable, and use the styles:
1. Import Inter and the CSS file:
```javascript
import { Inter } from 'next/font/google';
import styles from '../styles/component.module.css';
const inter = Inter({ variable: '--font-inter' });
```
2. Apply the font in your compone... |
What is the default script loading strategy for third-party scripts in Next.js, according to the latest version? | afterInteractive |
What ReactDOM method in Next.js is used to preemptively initiate a connection to an origin, and what is the resulting element in the head output? | ReactDOM preconnect method
```html
<link rel="preconnect" href="..." crossorigin />
``` |
What happens if a relative path is used in a URL-based metadata field without a configured metadataBase in Next.js? | Build error. |
What types of authorization checks are recommended for controlling user access and actions within a Next.js application according to the document? | Optimistic and Secure authorization checks. |
Which cache does `revalidatePath` purge immediately when used as a server action, according to the current behavior in Next.js? | Client-side Router Cache |
In Next.js, how is the global application of the Inter font achieved using CSS variables with version 12 or later? | Use the `Inter` font with a CSS variable in `app/layout.tsx`, and apply it in `global.css` as follows:
```css
html {
font-family: var(--font-inter);
}
``` |
In Next.js, which environment variable is used as the metadataBase default value for production deployments on Vercel when it is not explicitly configured? | VERCEL_PROJECT_PRODUCTION_URL |
In a production environment using Next.js version 15.2.0, what message is displayed for errors forwarded from server components? | A generic message with an identifier. |
Which experimental Next.js feature allows the use of the `forbidden` and `unauthorized` APIs by configuration, and what is its status in terms of stability? | authInterrupts (experimental, canary channel) |
What CSS variable is used to style `<h1>` tags with the Roboto Mono font in a Next.js application as described? | --font-roboto-mono |
What header value prevents the caching of the service worker in the application using Next.js? | Cache-Control: no-cache, no-store, must-revalidate |
In a Next.js application, what is the purpose of the `reset()` function in error boundary components? | To attempt to recover from an error by re-rendering the error boundary's contents. |
What is the required folder to upload to your CDN to ensure server code and configurations are not publicly exposed in a Next.js project? | .next/static/ |
What is the primary security measure implemented to protect against clickjacking attacks in Next.js? | X-Frame-Options: DENY |
What is the primary function of the `revalidate` configuration in the context of Incremental Static Regeneration in Next.js (Vercel)? | To specify the duration (in seconds) after which a page's cache is invalidated and a new version is generated in the background. |
What is the primary mechanism in Next.js for dynamically adjusting routes to accommodate different locales based on user preferences? | Middleware |
What is an unsupported pattern when interleaving Client and Server Components in Next.js? | Importing Server Components into Client Components |
What happens to the pre-rendering of data fetching operations when the `dynamicIO` flag is enabled and not explicitly cached in Next.js's experimental configuration? | Data fetching operations are excluded from pre-renders. |
What is the purpose of the `use cache` directive in Next.js when added to asynchronous functions? | To cache the output of the function. |
What happens to Server Components nested inside Client Components when a new request is made to the server, according to Next.js architecture? | Server Components are rendered first, including those nested inside Client Components. The rendered result contains references to the locations of Client Components, which React then reconciles into a single tree. |
What is the effect of disabling the `generateEtags` option in the `next.config.js` file for HTML pages in Next.js? | Disabling `generateEtags` stops the generation of etags for HTML pages, which may affect cache strategy. |
What potential security risk can occur if untrusted URLs are used with the `router.push` method in Next.js? | Cross-site scripting (XSS) vulnerabilities. |
What feature in Next.js allows for improved SEO and web shareability by moving metadata management from `index.html` into the Next.js framework? | Metadata API |
Which header is automatically added to all Vercel deployments unless declared in `next.config.js` for HTTPS enforcement and what value is used specifically for `max-age`? | Strict-Transport-Security, max-age=63072000 |
What happens to unused Server Actions in Next.js during the build process? | Unused Server Actions are removed from the client bundle during the build process. |
What must be ensured in the Google Analytics settings to automatically track client-side navigations in a Next.js application? | Ensure that "Enhanced Measurement" is enabled and the "Page changes based on browser history events" checkbox is selected in the Google Analytics Admin panel. |
What directive must be added to the top of a new file to define a Client Component in Next.js's app directory? | 'use client' |
In Next.js, what option can be used to ensure that only paths returned by `generateStaticParams` are served, while unspecified routes return a 404? | dynamicParams = false |
What is the property used to specify different languages for a URL in a Next.js sitemap with localization support? | alternates |
Which specific method would you use to check if a particular cookie exists in the incoming HTTP request using Next.js, and what is the expected return type? | `request.cookies.has('cookieName')` returns `true` or `false`. |
How does metadata evaluation order affect the replacement of duplicate keys in Next.js routes? | Metadata evaluation order affects duplicate key replacement by replacing earlier metadata entries with those from segments evaluated later in the order. |
What is the significance of prefixing environment variables with `NEXT_PUBLIC_` in a Next.js application, specifically regarding JavaScript bundling? | To expose environment variables to the browser by inlining them into the JavaScript bundle during `next build`. |
What feature did Next.js 9.1 introduce that allows for better organization of application directories? | `src` Directory Support |
In a Next.js application, what is the impact of building with environment variables prefixed with `NEXT_PUBLIC_` on the ability to modify these variables at runtime, particularly in scenarios involving Docker images or Heroku pipelines? | Environment variables prefixed with `NEXT_PUBLIC_` are inlined at build time and cannot be modified at runtime. |
In Next.js, how can you pass additional arguments to a Server Action within a form component? | In Next.js, use the JavaScript `bind` method to pass additional arguments to a Server Action within a form component. |
What compliance feature was introduced in Next.js 9.1.7 to enhance React integration? | React Strict Mode Compliance and Opt-In |
What method in Next.js allows programmatic form submission triggered by a keyboard shortcut? | requestSubmit() |
In the custom Link component, what happens if there are unsaved changes and the user attempts to navigate away? | Navigation is blocked, and a confirmation prompt appears. |
End of preview. Expand in Data Studio
Samples in this benchmark were generated by RELAI using the following data source(s):
Data Source Name: Next.js
Documentation Data Source Link: https://nextjs.org/docs
Data Source License: https://github.com/vercel/next.js/blob/canary/license.md
Data Source Authors: Vercel
AI Benchmarks by Data Agents © 2025 RELAI.AI · Licensed under CC BY 4.0. Source: https://relai.ai
- Downloads last month
- 4