1. Introduction

Incremental Static Regeneration (ISR) is a feature in Next.js that allows you to update static pages after you’ve built your application. It enables you to create or update static pages without rebuilding the entire site, improving performance and user experience.

2. Key Concepts

• Static Generation: Pre-rendering pages at build time.
• Incremental Static Regeneration: Updating static content after the build.
• Revalidation: The process of updating the cached content.

3. Step-by-Step Implementation

To implement Incremental Static Regeneration in a Next.js application, follow these steps:

1. Create a Next.js project (if you haven't already).
2. Define your page component using getStaticProps.
3. Set the revalidation time with the revalidate property.
4. Deploy your application to Vercel or any other hosting service.

Code Example

import { useEffect } from 'react';

export async function getStaticProps() {
    const res = await fetch('https://api.example.com/data');
    const data = await res.json();

    return {
        props: {
            data,
        },
        revalidate: 10, // Regenerate the page every 10 seconds
    };
}

const Page = ({ data }) => {
    return (
        

            
Data from API
            
{JSON.stringify(data, null, 2)}
        
    );
};

export default Page;
                    

4. Best Practices

• Use ISR for pages that require frequent updates.
• Monitor the revalidation time to balance performance and freshness.
• Consider fallback options for loading states.

5. FAQ