Why is my fetched data undefined in Next.js when using getStaticProps?

Troubleshooting Next.js Data Fetching with getStaticProps

Despite implementing the getStaticProps method in your Next.js application, you are encountering an issue where the fetched data is undefined. The issue is likely related to your file structure, and the following guidance will address this problem.

Server Components

In recent versions of Next.js, page components within the pages folder (the traditional method of setting up routes) utilize Server Components for server-side data fetching.

Data Fetching Within App Directory

After transitioning to the app directory (the preferred approach for Next.js 13), you can leverage Server Components to retrieve data directly within the component body. This is accomplished as illustrated in the provided code snippet, with specific comments for guidance.

Import Request Cookies and Headers

import { cookies, headers } from "next/headers";

Fetching Data Based on Caching Options

// Force caching until manually invalidated, similar to getStaticProps
const staticData = await fetch(`https://...`, { cache: "force-cache" });

// Refetch on every request, similar to getServerSideProps
const dynamicData = await fetch(`https://...`, { cache: "no-store" });

// Cache with a lifespan of 10 seconds, similar to getStaticProps with revalidate
const revalidatedData = await fetch(`https://...`, {
  next: { revalidate: 10 },
});

Non-Fetch Data Request

You can omit fetch() and directly access data using libraries or ORM. In this scenario, you may utilize Route Segment Config, as demonstrated in the code below:

// revalidate every 10 seconds
export const revalidate = 10;

// no caching
export const dynamic = "force-dynamic";

Database Interaction with Prisma

import prisma from "./lib/prisma";

const posts = await prisma.post.findMany();

By adhering to these recommendations, you can effectively fetch data in your Next.js application, regardless of the file structure or data fetching method you employ.

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