# Next.js Data Fetching (React / Next.js)

> Server-side rendering (SSR), static generation (SSG), incremental static regeneration (ISR), streaming

- 24 interview questions
- Mid-Level
- [Interview Questions: React / Next.js](https://sharpskill.dev/en/technologies/react-next/interview-questions.md)

## 1. What is the default behavior of Server Components in Next.js App Router for data fetching?

**Answer**

Server Components perform data fetching on the server with each request by default, ensuring fresh data. Unlike Pages Router where getServerSideProps was needed, Server Components make SSR implicit. For static caching, the cache: 'force-cache' option must be added to fetch.

## 2. Which fetch cache option is equivalent to getStaticProps in Pages Router?

**Answer**

The cache: 'force-cache' option tells Next.js to cache the response until manually invalidated, equivalent to getStaticProps. This strategy generates static content that remains cached indefinitely. The 'no-store' option equals getServerSideProps (re-fetch every request), while next.revalidate equals getStaticProps with revalidate (ISR).

## 3. How to force dynamic data fetching on every request (getServerSideProps equivalent)?

**Answer**

The cache: 'no-store' option completely disables caching and forces re-fetching on every request, equivalent to getServerSideProps. This strategy ensures always fresh data but increases latency. Use for real-time data (dashboards, notifications, live prices) where freshness is critical.

## 21 more questions available

- How to implement ISR (Incremental Static Regeneration) with hourly revalidation?
- What does 'export const revalidate = 60' export at page level do?

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## Other React / Next.js interview topics

- [JavaScript Essentials](https://sharpskill.dev/en/technologies/react-next/interview-questions/javascript-essentials.md): 25 questions, Junior
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- [Forms & Controlled Components](https://sharpskill.dev/en/technologies/react-next/interview-questions/forms-controlled-components.md): 20 questions, Mid-Level
- [Data Fetching & API](https://sharpskill.dev/en/technologies/react-next/interview-questions/fetching-data-api.md): 20 questions, Mid-Level
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