Decoding Next.js 14: Server vs. Client Components — Deciding the Right Architecture for Your Project

With the rising popularity of Next.js, many companies are choosing Next.js as their main tech stack for building web apps. Take a look at “The Next.js Showcase”. This demonstrates the genuine excitement and widespread adoption of Next.js!

However, developers frequently struggle to pick the best component architecture between “server-side” and “client-side” components.
Therefore, In this article, we’ll delve into the concepts of client-side rendering (CSR) and server-side rendering (SSR) within Next.js. We’ll uncover how Next.js manages rendering on both the client and server sides, grasp the advantages and drawbacks of each method, and gain practical insights into integrating CSR and SSR into Next.js applications.

Introduction Story

When we create a React or Next JS application, it is critical to consider what components should be rendered in the server and the client. As we know, Next.js employs a blend of server-side and client-side rendering to optimize performance. Nonetheless, it would be best to ascertain which parts of the application are rendered on the server.
If that is the case, how would you accomplish it?

Before we answer these questions, let’s go back and remind ourselves what we mean by client-side and server-side rendering.

Client Side Rendering

The Client-side rendering (CSR) involves rendering web content by downloading a minimal HTML page containing JavaScript code to the browser. With CSR, all components are bundled and sent to the client for execution and rendering. Consequently, as the application expands, so does the bundle size, as it must accommodate all components. This results in larger bundles, requiring more memory in the client to load all components.

The few issues that we see with client-side rendering are

• Bundle Size Increase as the web app grows.
• Search engine bots and Google crawlers face difficulty indexing our pages because they cannot execute JavaScript code as a web browser does.
• Sensitive Data — such as User Info, API key etc which are called on client, are exposed and can be misused.

Server Side Rendering

The Server side renderig (SSR) means that

What is Client and Server Component

Server Componet — A react component that runs/renders on the server, i.e. the infra or place where we’ll deploy our application.
In Next JS all the components are by default server component.

Client Componet — A react component that runs/renders on the user’s device, such as a web browser or mobile app.
To make any component as “Client component”, we need to add directive called “use client” at the top of the file.

Server Componet Vs Client Componet ?

To simplify things, the Next.js documentation provides a helpful table that guides you on where to render each component. Read Here

Here’s a quick summary of the different use cases for Server and Client Components:

UI Component Architecture

1. Root Layout (App Shell)

This includes:

• Overall page layout
• Grid or flex structure
• Spacing and alignment
• Static wrappers

Recommended: Server Component

This layer has no interactivity. Its job is to structure the page and fetch high-level data if needed (like user session or layout-level config).

Keeping this on the server means:

• Zero JS sent to the browser
• Faster initial load
• Cleaner separation of concerns
• Think of this as the skeleton of your app.

2. Navbar

Contains:

• Logo
• Search bar
• Possibly user info

Split responsibility:

• Navbar wrapper: Server Component
• Search input: Client Component

Why split it?

The navbar layout and logo are static. They don’t need JavaScript.

The search input, however, needs:

• onChange handlers
• debouncing
• keyboard interaction
• client-side state

So the ideal approach is:

• Render the navbar on the server
• Nest a small client component for the search functionality

This keeps the JS footprint minimal while preserving interactivity.

3. Sidebar

Contains:

• Navigation list
• Menu items
• Possibly icons and labels

Recommended: Server Component

Sidebars usually:

• Render from static or database-driven data
• Don’t change often
• Don’t require client-side state

Rendering this on the server gives:

• Better performance
• Better SEO
• No unnecessary hydration cost

If you later add collapsible behavior or animations, you can convert only the required part into a client component.

4. Sidebar Items

Each item is:

• A link
• Possibly conditionally rendered based on role/permission

Recommended: Server Component

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Authorization logic fits naturally on the server.
You can decide what to show before the HTML ever reaches the browser.

This also avoids exposing permission logic to the client.

5. Content Page (Main Area)

This is where most of the confusion happens.

The content page itself:

• Fetches data
• Structures cards
• Decides what appears

Recommended: Server Component

Why?

• Data fetching is faster on the server
• No API keys exposed
• Better caching with Next.js
• Less JavaScript sent to the browser

The page should orchestrate the UI, not handle interactions.

6. Cards

Each card includes:

• Avatar
• Title
• Button

Recommended: Server Component (by default)

Cards are mostly presentational. They receive data and render UI. If there’s no local state or browser-only logic, they belong on the server.

This is one of the biggest mindset shifts with Next.js 14:

Just because something looks interactive doesn’t mean it needs to be a client component.

7. Avatar

Recommended: Server Component

An avatar is just an image or placeholder. No event handling. No browser APIs.

Rendering it on the server:

• Improves performance
• Reduces hydration cost
• Keeps things simple

8. Title / Text Content

Recommended: Server Component

Pure text is the easiest decision. No interactivity. No state. No reason to ship JS.

9. Button

Here’s where nuance matters.

If the button:

• Navigates to another page
  → Server Component (Link)

If the button:

• Opens a modal
• Triggers client-side state
• Calls a client-only API
  → Client Component

In the diagram, the “Click Me” button implies interaction.

Best approach:

• Keep the card as a server component
• Extract the button into a small client component

This keeps interactivity scoped and avoids turning the entire card (or page) into a client component unnecessarily.

The Key Pattern to Remember

Server by default. Client only when required.

Instead of asking:
“Should this be server or client?”

Ask:

• Does this need state?
• Does this need browser APIs?
• Does this need event listeners?

If the answer is no, keep it on the server.

If the answer is yes, isolate the smallest possible client component and embed it inside a server component.

Conclusion

Next.js doesn’t force you to choose between Server and Client Components.
It gives you the tools to compose them intentionally.

The real power comes from:

• Keeping data fetching and layout on the server
• Pushing interactivity down to small, focused client components
• Avoiding unnecessary "use client" at the page or layout level

When you design your UI this way:

• Your bundle stays small.
• Your app loads faster
• Your architecture scales cleanly as features grow
• If there’s one takeaway from this article, it’s this:

Treat Client Components as a sharp tool, not a default choice.

Use them when you need them. Avoid them when you don’t.

Score Achieved using the above technique.

By mastering the balance between Server and Client Components, you’ll be well-equipped to build the next generation of web applications with Next.js.

Happy Coding