Next.js getServerSideProps Error Fix

In this tutorial, you'll learn about Next.js getServerSideProps Error Fix. We cover key concepts, practical examples, and best practices.

The Problem

Error: getServerSideProps can only be exported from a page, not from a component.

getServerSideProps is only valid in page components inside the pages/ directory.

Wrong

// components/Header.js
export async function getServerSideProps() {
  const data = await fetchData()
  return { props: { data } }
}

Output: build error — getServerSideProps cannot be used in a non-page component.

Right

Move the data fetching to the page:

// pages/index.js
export async function getServerSideProps(context) {
  const data = await fetchData()
  return { props: { data } }
}

export default function Home({ data }) {
  return <Header data={data} />
}

// components/Header.js — no data fetching
export default function Header({ data }) {
  return <nav>{data.map(item => <a key={item.id}>{item.name}</a>)}</nav>
}

Expected output: page renders on each request with fresh data.

Prevention

• Use getServerSideProps only in page files under pages/
• Pass fetched data as props to child components
• Use SWR or React Query for client-side data fetching in components

Common Mistakes with getserversideprops

1. Using return to exit a function early instead of wrapping a pure value in the monad
2. Mixing let bindings with <- bindings in do notation, producing type errors
3. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors

These mistakes appear frequently in real-world NEXTJS code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ