Cache invalidation strategies in NextJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is cache invalidation in Next.js?

Cache invalidation is the process of updating or removing stored data so users see fresh content instead of outdated information.

beginner

Explain the 'Time-based' cache invalidation strategy.

Time-based invalidation removes or refreshes cached data after a set time, ensuring content updates regularly without manual intervention.

intermediate

What is 'On-demand' cache invalidation in Next.js?

On-demand invalidation lets you manually clear or update cache when data changes, often using API routes or server actions to trigger refresh.

intermediate

How does Next.js support cache invalidation with Incremental Static Regeneration (ISR)?

ISR allows pages to be statically generated and then updated in the background after a set time, combining fast load with fresh content.

beginner

Why is cache invalidation important in web apps?

It keeps user data fresh, improves performance by avoiding unnecessary reloads, and prevents showing outdated or wrong information.

Which Next.js feature helps update static pages after deployment without rebuilding the whole site?

A Static Site Generation (SSG)

B Incremental Static Regeneration (ISR)

C Client-side Rendering (CSR)

D Server-side Rendering (SSR)

ISR allows static pages to update after deployment by regenerating them in the background.

What does 'time-based' cache invalidation rely on?

A Manual user action

B Data change detection

C A set expiration time

D Random cache clearing

Time-based invalidation uses a set expiration time to refresh cache automatically.

Which method lets you clear cache manually in Next.js?

A Static generation

B Time-based invalidation

C Automatic cache refresh

D On-demand invalidation

On-demand invalidation allows manual cache clearing when data changes.

Why avoid never invalidating cache in a web app?

A It shows outdated data

B It improves performance

C It reduces server load

D It speeds up page loads

Never invalidating cache can cause users to see outdated or wrong information.

What is a common tool to trigger on-demand cache invalidation in Next.js?

A API routes

B Static files

C CSS modules

D Client-side hooks

API routes can be used to trigger cache clearing or regeneration on demand.

Describe three cache invalidation strategies used in Next.js and when to use each.

Think about how and when cached data should update.

Explain why cache invalidation is important for user experience in web applications.

Consider what happens if cache never updates.