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Next.js App Router: When Server Components Win
By First Data Team, Engineering & Product
Practical boundaries between server and client components on marketing and product sites.
Server Components are the default for content-heavy pages: blog posts, docs, and landing sections that rarely need browser APIs ship as HTML with minimal JavaScript.
Client boundaries belong where interactivity lives, filters, carts, theme toggles, and animations. Wrap small islands; don't client-wrap entire layouts out of habit.
Data fetching on the server keeps secrets off the wire and improves TTFB. Cache tags and revalidation windows should match how stale your business can tolerate each page.
For bilingual sites, resolve locale on the server when possible so the first paint is already in the correct direction and language, no flash of wrong content.