Next.js Incremental Static Regeneration Error Fix

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

The Problem

Error: A revalidate value of 0 is not supported for ISR. Use getServerSideProps for SSR.

Setting revalidate: 0 in getStaticProps is invalid. ISR requires a positive integer.

Wrong

export async function getStaticProps() {
  return {
    props: { data },
    revalidate: 0, // Invalid
  }
}

Output: build error — revalidate: 0 is not allowed.

Right

export async function getStaticProps() {
  return {
    props: { data },
    revalidate: 60, // Revalidate every 60 seconds
  }
}

export async function getStaticPaths() {
  return {
    paths: [{ params: { id: '1' } }],
    fallback: 'blocking',
  }
}

Expected output: page is re-generated in the background every 60 seconds. New data is available on the next request after revalidation.

Prevention

• Use revalidate values of 10 or higher for ISR
• Use fallback: 'blocking' for SEO-friendly dynamic routes
• Use on-demand revalidation with res.revalidate() for event-driven updates

Common Mistakes with incremental static

1. Using foldl instead of foldl' causing stack overflow on large lists
2. Forgetting deriving (Show, Eq) on custom data types needed for debugging
3. Placing the wildcard pattern first in case expressions, making all subsequent patterns unreachable

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