Caching Strategies in Next.js

1. Introduction

Caching is a crucial performance optimization technique that reduces load times and server load. This lesson covers caching strategies in Next.js, including key concepts, implementation methods, and best practices.

2. Key Concepts

3. Caching Strategies

3.1 Static Site Generation (SSG)

Next.js allows you to generate static HTML pages at build time. These pages are cached by the CDN, resulting in fast load times.

        // pages/index.js
        export async function getStaticProps() {
            const res = await fetch('https://api.example.com/data');
            const data = await res.json();
            return { props: { data }, revalidate: 10 }; // Regenerate every 10 seconds
        }
        

3.2 Incremental Static Regeneration (ISR)

ISR allows you to update static pages after the initial build without rebuilding the entire site. This is useful for frequently changing content.

3.3 Client-Side Caching

Utilize client-side caching by storing data in localStorage or sessionStorage for improved performance.

        // Example of storing data in localStorage
        localStorage.setItem('key', JSON.stringify(data));
        

3.4 API Caching

Cache API responses on the server to reduce the time taken to fetch data.

4. Best Practices

• Use SSG for static content that does not change frequently.
• Implement ISR for pages that need to be updated regularly.
• Leverage API caching for faster response times.
• Utilize client-side caching for improved user experience.
• Monitor cache expires to ensure users see the latest content.

5. FAQ