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What are loading.js and error.js files in Next.js?

loading.js provides a UI fallback while a route or component is loading, enabling smoother user experiences with React Suspense. error.js creates error boundaries for routes and displays custom error handling interfaces instead of crashing the entire application. These files are part of the App Router's built-in conventions.

Related Drills

How does server-side rendering (SSR) in Next.js App Router differ from Static Site Generation (SSG)?

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What is Next.js and why is it used?

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What is the difference between React and Next.js?

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JB

Jeevan Bhargav

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This answer is calibrated for technical interviews. Verify benchmarks in local sandboxes before deploying.