Javascript

Maximizing Server Rendering for Interactive Next.js Applications

Published May 15, 2024

Updated May 15, 2024

5 min read

Maximizing Server Rendering for Interactive Next.js Applications

Next.js has come a long way since its inception, and it's now a powerful framework that combines both server-side and client-side rendering. With the introduction of React Server Components (RSCs) and the classic client components, you have the flexibility to create a purely client-rendered app with many client components or a purely server-rendered app using RSCs. However, what if you want to have the best of both worlds?

Server rendering improves performance and can deliver much of the HTML quickly, reducing the need for the client to render the entire page. This also results in smaller bundles delivered to the client. The question is, how would you maximize server rendering while still having an interactive application? This blog post will show you how.

Building a Lightweight Shopping Experience

To illustrate the concept, we'll build a lightweight shopping experience with a list of products and an "Add to Cart" button that opens a drawer with the added cart items. Most of the page will be server-rendered, and we'll use client components only to show the drawer. Even the drawer itself will not be entirely a client component; rather, the wrapper necessary to show the drawer will be a client component, while the contents will be server-rendered.

This can be accomplished by the nature of client components that can accept server-rendered content. We'll set up a React context provider at the layout level, which will control showing or hiding the cart. This provider will be used by our client components (the "Add to Cart" button and the "Show Cart" button), as well as by the drawer wrapper.

When you click "Add to Cart," this will invoke a server action (more on that later), and then use a function provided through the context of the provider to show the drawer.

The Code

For this example, we'll use shadcn as our component library. It looks nice, and it also provides a good, accessible component for our cart drawer. Looking at our wireframe above, we'll need a total of three components:

The components can be installed with a single command:

npx shadcn-ui@latest button table sheet

Next, we'll set up our React context provider:

// app/layout.tsx
export default function RootLayout({
  children,
}: Readonly<{
  children: React.ReactNode;
}>) {
  return (
    <html lang="en">
      <CartProvider>
        <body
          className={cn(
            "min-h-screen bg-background font-sans antialiased",
            fontSans.variable,
          )}
        >
          {children}
        </body>
      </CartProvider>
    </html>
  );
}

// app/components/cart-provider.tsx
"use client";

import { createContext, useState } from "react";

type CartProviderContextValue = {
  isCartShown: boolean;
  setCartShown: (isCartShown: boolean) => void;
};

export const CartContext = createContext<CartProviderContextValue>({
  isCartShown: false,
  setCartShown: () => {},
});

export interface CartProviderProps {
  children?: React.ReactNode;
}

export default function CartProvider({ children }: CartProviderProps) {
  const [isShown, setShown] = useState(false);

  return (
    <CartContext.Provider
      value={{
        isCartShown: isShown,
        setCartShown: setShown,
      }}
    >
      {children}
    </CartContext.Provider>
  );
}

The provider provides a boolean flag to indicate whether the cart is currently shown (isCartShown) and a function to change that (setCartShown). Note that CartProvider is a client component, but its contents are provided as children. Therefore, CartProvider is just a thin client-component wrapper around its contents.

Now, let's see the implementation of the "Add to Cart" button and the CartDrawer component. The AddToCartButton is a client component that reads the React context and calls its setCartShown function after adding to the cart has been completed. This will, in turn, set the isCartShown flag on the provider and show the cart drawer, which also reads the isCartShown flag from the provider. How is the cart updated, though? We'll use a server action named addToCartAction for that. We'll explain how this works in a bit, but in the meantime, let's see the implementations of the AddToCart button and the CartDrawer component.

// app/components/add-to-cart-button.tsx
"use client";

import { addToCartAction } from "@/app/actions/cart";
import { Button } from "@/app/components/ui/button";
import { useContext } from "react";
import { CartContext } from "@/app/components/cart-provider";

export type AddToCartButtonProps = {
  productId: number;
};

export default function AddToCartButton({ productId }: AddToCartButtonProps) {
  const { setCartShown } = useContext(CartContext);

  const handleAddToCart = async () => {
    await addToCartAction(productId);
    setCartShown(true);
  };

  return <Button onClick={handleAddToCart}>Add to Cart</Button>;
}

Similar to the CartProvider component, the' CartDrawer' component is a thin client component wrapper around its contents. It reads the React context provided by the CartProvider and passes it to the Sheet component from the Shadcn library. The SheetContent component accepts cart contents as children passed from the CartDrawer's parent, which is server-rendered.

// app/components/cart-drawer.tsx
"use client";

import {
  Sheet,
  SheetContent,
  SheetHeader,
  SheetTitle,
} from "@/app/components/ui/sheet";
import { useContext } from "react";
import { CartContext } from "@/app/components/cart-provider";

type CartDrawerProps = {
  children: React.ReactNode;
};

export default function CartDrawer({ children }: CartDrawerProps) {
  const { isCartShown, setCartShown } = useContext(CartContext);

  return (
    <Sheet open={isCartShown} onOpenChange={setCartShown}>
      <SheetContent>
        <SheetHeader>
          <SheetTitle>Cart</SheetTitle>
        </SheetHeader>
        {children}
      </SheetContent>
    </Sheet>
  );
}

Using Server Actions and Cache Invalidation

But how do we ensure that the contents are updated? The contents are an RSC component called CartContents that calls getCachedCart in the data access layer. In real-world scenarios, getCachedCart would probably call a database or an API, but we have neither here. So, we'll simulate a database through the use of the file-system-db package, a lightweight Node library that can write and read to a JSON file as a database.

The get calls to the database are wrapped in unstable_cache, which allows us to tag such requests with cart. This means CartContents is initially fetching data from the tagged getCachedCart call.

// app/data-access/cart.ts

export const getCachedCart = unstable_cache(
  async () => {
    return await getCart();
  },
  ["getCart"],
  { tags: ["cart"] },
);

export function getCart(): Promise<Cart> {
  return Promise.resolve(db.get("cart"));
}

Whenever we mutate the cart, we want to call invalidateTags("cart"). This will force purging of Next.js caches and consequently re-render the cart. For example, the "Add to Cart" button calls the addToCartAction server action, which adds the item to the database and calls invalidateTags("cart"). This server action call returns an updated RSC payload to the client, which re-renders the part that depended on the getCachedCart call - and that is the CartContents component.

// app/actions/cart.ts

export async function addToCartAction(productId: number) {
  await addToCart(productId);
  // Adding the following revalidates the data cache and makes this server action return updated RSC data, which the client part re-renders
  revalidateTag("cart");
}

// app/data-access/cart.ts
export async function addToCart(productId: number) {
  const product = PRODUCTS.find((product) => product.id === productId);
  if (product) {
    const cart = await getCart();
    cart.items.push(product);
    await db.set("cart", cart);
  }

  return Promise.resolve();
}

And that's it. We now have a fully functional, mostly server-rendered cart, where only small bits of interactivity are modeled as client components. Here is the result:

Some of the code shown above remains, such as the "Show Cart" button and the table of products, but those are just UX improvements on top of the core functionality. You can see the entire source code on Stackblitz.

Wrapping Up

In this blog post, we've explored how to maximize server rendering in Next.js while still having an interactive application. By leveraging React Server Components, client components, and server actions, we've created a shopping experience where most of the page is server-rendered, but the cart drawer is interactive and updates in real time. This approach improves performance, reduces the client-side rendering burden, and delivers smaller bundles to the client.

This Dot is a consultancy dedicated to guiding companies through their modernization and digital transformation journeys. Specializing in replatforming, modernizing, and launching new initiatives, we stand out by taking true ownership of your engineering projects.

We love helping teams with projects that have missed their deadlines or helping keep your strategic digital initiatives on course. Check out our case studies and our clients that trust us with their engineering.

About the author(s)

Dario Djuric
Dario is a full-stack engineer who has spent most of his career doing enterprise Java projects. He has always had a hidden passion for frontend, though -- and he is now able to pursue that passion at This Dot. He spends most of his free time with his two sons, but occasionally, he manages to squeeze in some casual sports activities such as jogging, cycling, and soccer.
@dario_djuric @dariodjuric

Communication Between Client Components in Next.js

Communication Between Client Components in Next.js In recent years, Next.js has become one of the most popular React frameworks for building server-rendered applications. With the introduction of the App Router in Next.js 13, the framework has taken a major leap forward by embracing a new approach to building web applications: the concept of server components and client components. This separation of concerns allows developers to strategically decide which parts of their application should be rendered on the server and which are then hydrated in the browser for interactivity. The Challenge: Communicating Between Client Components While server components offer numerous benefits, they also introduce a new challenge: how can client components within different boundaries communicate with each other? For instance, let's consider a scenario where you have a button (a client component) and a separate client component that displays the number of times the button has been clicked. 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The key aspect is that this wrapper component should be higher up in the tree (perhaps even in the layout) and accept server components as children. Next.js allows you to interleave client and server components as much as you want, as long as server components are passed to client components as props or as component children. Here's how this approach might look in practice. First of all, we'd create a wrapper client component that holds the state: ` This wrapper component can be included in the layout: ` Any server components can be rendered within the layout, potentially nesting them several levels deep. Finally, we'd create two client components, one for the button and one for the counter display: ` ` The entire client and server component tree is rendered on the server, and the client components are then hydrated in the browser and initialized. From then on, the communication between the client components works just like in any regular React application. 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The button reads the current counter value and updates it on click by using the router's replace function: ` The counter display component is relatively simple, only reading the counter value: ` And here is the page that is a server component, hosting both of the above client components: ` Feel free to check out the above page in the embedded Stackblitz below: Storing State on the Server The third approach is to store the state on the server. In this case, the counter display component accepts the counter value as a prop, where the counter value is passed by a parent server component that reads the counter value from the database. The button component, when clicked, calls a server action that updates the counter value and calls revalidatePath() so that the counter value is refreshed, and consequently, the counter display component is re-rendered. It's worth noting that in this approach, unless you need some interactivity in the counter display component, it doesn't need to be a client component – it can be purely server-rendered. However, if both components need to be client components, here's an example of how this approach might look. First, we'll implement a server action that updates the counter value. We won't get into the mechanics of updating it, which in a real app would require a call to the database or an external API - so we're only commenting that part. 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VercelNextJS

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In your local environment, that would be in .env.local, while staging/production or any other hosted environments would be configured in the provider. ` To get full coverage with New Relic, in Next.js, we need to cover the parts running on the client (in the browser) and on the server. The server-running part is different on Vercel's managed hosting, where all of the logic is executed within lambdas, and self-hosting variants, where the server logic is executed on a Node.js server. The client part is configured by going to the New Relic dashboard and clicking "Add Data" / "Browser Monitoring". Choose "place a JavaScript snippet in frontend code," name it the same name you used in the environment variable above, click "Continue" to the last step, and copy the part between the script tags: ` Then paste it to a variable inside any module of your code. For example, this is how we did it: ` Now, create a component that will use this script and put it to Next's Script component. Then you can use the component in your root layout: ` There are several things to note here. First, we need to set a unique ID for the Script component for Next.js to track and optimize the script. We also need to set the strategy to beforeInteractive so that the New Relic script is added to the document’s head element. Finally, we use some environment helper variables. IS_PRODUCTION and IS_STAGING are just helper variables that read the environment variables to determine if we are in a local environment, staging, or production. Now you can create an app router error page and report any uncaught errors to New Relic: ` With this in place, the client part is covered, and you should start seeing data in the New Relic dashboard under "All Entities" / "Browser Applications." Let's now focus on the server part, with both a self-hosted option and Vercel. 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Install the following packages: ` Then create a logger.ts file with the following code: ` NewRelicTransport utilizes the New Relic logging API to send application logs. Now you can use the serverLogger in your backend code, from server components to server actions. Conclusion As you can see, various options exist for integrating New Relic with the modern, app-router-based Next.js. Sadly, at the time of writing, no one-size-fits-all solution works equally for all hosting options, as Vercel's managed Next.js platform is still relatively young, and so is the app router in Next.js. If you liked this blog post, feel free to browse our other Next.js blog posts for more tips and tricks in other areas of the Next.js ecosystem....

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7 mins

NextJS

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Many users felt attracted to variables being instantly reactive in previous versions. ` There was, however, a lot of magic underneath and a considerable amount of work from the compiler to make it behave reactively. $state In Svelte 5, a reactive variable has to be explicitly declared using the $state rune, which brings a clear distinction between what is reactive and what isn’t. ` In the previous code, $state is not an actual function being called; it's a hint for the compiler to do something special with this declaration. Rune names always start with a dollar sign ($) and do not need to be imported. However, there’s much more to the changes than just the way we declare reactive variables. Runes bring a lot of new features that make Svelte 5 a great improvement. In Svelte 5, objects or arrays use Proxies to allow for granular reactivity, meaning that individual properties in an object are reactive, even if they are nested objects or arrays. If you modify a property, it will only update that property and will not trigger an update on the whole object. It also supports triggering updates when methods like array.push are called. In previous versions, an assignment was required to trigger an update: ` To have a similar behavior of svelte 4 (no deep reactivity), use the $state.raw() rune. This syntax of .* is common for related features of a rune: $state.raw() will require an assignment to trigger reactivity. ` Because proxies are used, you may need to extract the underlying state instead of the proxy itself. In that case, $state.snapshot() should be used: ` $derived We will use $derived and $derived.by to declare a derived state. The two runes are essentially the same, except one allows us to use a function instead of an expression, allowing for more complex operations to calculate the derived values. ` $effect Effects are useful for running something triggered by a change in state. One of the things you'll note from the $effect rune is that dependencies don't need to be explicit. Those will be picked from reactive values read synchronously in the body of the effect function. ` Something to bear in mind is that these dependencies are picked each time the effect runs. The values read during the last run become the dependencies of the effect. ` Depending on the result of the random method, foo or bar will stop being a dependency of the effect. You should place them outside the condition so they can trigger reruns of the effect. *Variants* of the effect rune are $effect.pre, which runs before a DOM update, and $effect.tracking(), which checks for the context of the effect (true for an effect inside an effect or in the template). $props This rune replaces the export let keywords used in previous versions to define a component's props. To use the $props syntax, we can consider it to return an object with all the properties a component receives. We can use JavaScript syntax to destructure it or use the rest property if we want to retrieve every property not explicitly destructured.. ` $bindable If you want to mutate a prop so that the change flows back to the parent, you can use the $bindable prop to make it work in both directions. A parent component can pass a value to a child component, and the child component is able to modify it, returning the data back to the parent component. ` $inspect The $inspect rune only works in dev mode and will track dependencies deeply. By default, it will call console.log with the provided argument whenever it detects a change. To change the underlying function, use $inspect.with().with): ` $host The host rune gives access to the host element when compiling as a custom element: ` ` Other changes Another important change is that component events are just props in Svelte 5, so you can destructure them using the $props() rune: ` A special children property can be used to project content into a component instead of using slots. Inside the components, use the [@render[(https://svelte.dev/docs/svelte/@render) tag to place them. ` Optional chaining (?.) prevents from attempting to render it if no children are passed in. If you need to render different components in different places (named slots before Svelte 5, you can pass them as any other prop, and use @render with them. Snippets Snippets allow us to declare markup slices and render them conveniently using the render tag (@render). 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Nov 27, 2024

4 mins

Svelte

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Whether it's modernization or custom software solutions, our team of experts can guide you through best practices and how to build scalable, performant software that lasts.

Maximizing Server Rendering for Interactive Next.js Applications

Maximizing Server Rendering for Interactive Next.js Applications

Building a Lightweight Shopping Experience

The Code

Using Server Actions and Cache Invalidation

Wrapping Up

Dario Djuric

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