This article demonstrates how to implement client-side caching in a Next.js application using AWS Amplify and TanStack React Query.

• TanStack React Query provides declarative caching and state management for modern web applications
• Install @tanstack/react-query and wrap app with QueryClientProvider in pages/_app.js
• Use useQuery hook to fetch GraphQL data and manage it in the query cache
• Update subscriptions to modify cached query results using queryClient.setQueryData
• Implement optimistic UI updates with useMutation to instantly reflect user actions
• Automatically revalidate cache based on browser conditions like network connectivity changes
• Leverage Next.js SSR to pre-populate query cache from server data

The article shows how to enhance a product management app with caching, enabling instant UI updates, automatic revalidation, and seamless offline functionality while maintaining real-time subscription updates.