Server-side rendering (SSR) has been around for a while, but it's worth exploring further. This technique can make your web apps faster and more SEO-friendly.
In this guide, we'll explain SSR, why you might want to use it, and how to implement it without pulling your hair out. We'll cover the basics, compare it to client-side rendering, and discuss some practical examples.
What is server-side rendering?
Fundamentally, SSR is about rendering your web pages on the server instead of in the browser. When a user requests a page, the server does all the heavy lifting and sends a fully rendered page to the client. Then, the client-side JavaScript takes over to make it interactive.
The server is doing the prep work in the kitchen, and the browser just has to plate and serve.
Here's a minimal Express.js example:
const express = require('express');
const React = require('react');
const ReactDOMServer = require('react-dom/server');
const App = require('./App');
const app = express();
app.get('/', (req, res) => {
const html = ReactDOMServer.renderToString(<App />);
res.send(`
<!DOCTYPE html>
<html>
<body>
<div id="root">${html}</div>
<script src="client.js"></script>
</body>
</html>
`);
});
app.listen(3000, () => console.log('Server running on port 3000'));
From server to browser with fully rendered pages
When we talk about SSR delivering "fully rendered pages," it's important to understand what that actually means. Let's break it down:
What is a fully rendered page?
A fully rendered page is an HTML document containing all the content users would get when they first load the page. This includes:
- The complete DOM structure
- All text content
- Image placeholders and other media elements
- Initial styles
Here's a basic example:
<!DOCTYPE html>
<html>
<head>
<title>My SSR Page</title>
<style>
/* Initial styles */
</style>
</head>
<body>
<header>
<h1>Welcome to My Site</h1>
<nav><!-- Fully populated navigation --></nav>
</header>
<main>
<article>
<h2>Article Title</h2>
<p>This is the full content of the article...</p>
</article>
</main>
<footer><!-- Fully populated footer --></footer>
<script src="hydration.js"></script>
</body>
</html>
The difference between CSR
In contrast, a client-side rendered (CSR) initial HTML might be like this:
<!DOCTYPE html>
<html>
<head>
<title>My CSR Page</title>
</head>
<body>
<div id="root"></div>
<script src="bundle.js"></script>
</body>
</html>
The CSR page relies entirely on JavaScript to populate the content.
Benefits of fully rendered HTML
Faster Initial Paint: The browser can start rendering content immediately.
Better SEO: Search engines read all your content without executing JavaScript.
Improved Accessibility: Screen readers and other assistive technologies can access content immediately.
Resilience: Basic content is available even if JavaScript fails to load.
The hydration process
After sending the fully rendered HTML, SSR applications typically go through a process called
In essence, CSR works more in the browser, while SSR does more on the server. The choice between them depends on your project's specific needs, balancing factors like initial load time, SEO requirements, and server resources.
SSR and search engines: a match made in HTTP
Server-side rendering can have a big impact on how search engines see your site. Let's break it down:
- Faster Indexing
Search engine bots are impatient. They want to see your content NOW. With SSR, your pages are ready to go when the bot comes knocking — no waiting around for JavaScript to load and render.
:
// app/page.js
async function getData() {
const res = await fetch('<https://api.example.com/data>')
if (!res.ok) {
throw new Error('Failed to fetch data')
}
return res.json()
}
export default async function Home() {
const data = await getData()
return <h1>Hello {data.name}</h1>
}
In this example:
- The
Homecomponent is an async function, allowing for server-side . - It waits for the data to be fetched.
- It renders the component with the fetched data.
- The fully rendered HTML is sent to the client.
- Once the JavaScript loads in the browser, the page becomes interactive.
: A full stack web framework that leverages React Router.
- Angular Universal: The official SSR solution for Angular applications.
: The official application framework for Svelte with SSR support.
JavaScript (Framework-agnostic)
: A new framework designed for optimal performance with built-in SSR support.
: Offers SSR capabilities through .
or
or : Can be configured for SSR, often used with extensions like Flask-SSE.
Each of these frameworks offers its own approach to SSR, often with additional features like static site generation, API routes, and more. The choice depends on your preferred language, ecosystem, and specific project requirements.
Deployment and caching
When deploying an SSR app:
- Build both client-side and server-side bundles.
- Run the SSR server as a background process.
- Use a process monitor like PM2 or Supervisor to keep your server running.
Here's a basic deployment flow:
Key features
Framework Agnostic: Builder.io works with various frameworks that support SSR and SSG.
Automatic Optimization: Builder optimizes your content for performance, including code splitting and lazy loading of off-screen components.
Dynamic Rendering: You can render different content based on user attributes or .
Easy Integration: Builder provides :
CODEimport { builder, BuilderComponent } from '@builder.io/react'
builder.init('YOUR_API_KEY')
export async function getStaticProps({ params }) {
const page = await builder
.get('page', {
userAttributes: {
urlPath: '/' + (params?.page?.join('/') || '')
}
})
.toPromise()
return {
props: {
page: page || null,
},
revalidate: 5
}
}
export default function Page({ page }) {
return (
<BuilderComponent
model="page"
content={page}
/>
)
}
Best practices
- Ensure you're using a framework that supports SSR or SSG.
- Follow your framework's guidelines for fetching data server-side when integrating Builder Pages or Sections.
- Refer to the
getAsyncPropsREADME for more information on handling server-side data.
By leveraging Builder for SSR, you can combine the flexibility of a experience.
Wrapping up
Server-side rendering (SSR) is a powerful approach in web development that can significantly enhance your application's performance, SEO, and user experience. Throughout this article, we've explored what SSR is, how it differs from client-side rendering, its impact on search engines, and practical implementation strategies using popular frameworks like Next.js.
We've also discussed the concept of fully rendered pages and examined various SSR solutions across different ecosystems. While SSR offers many benefits, it's important to consider your project's specific needs when deciding whether to implement it.
FAQ
Q: How does SSR affect my development workflow?
A: SSR can make development more complex, as you need to consider both server and client environments. You might need to adjust your build process and be cautious with browser-specific APIs.
Q: How does SSR impact my site's Time to Interactive (TTI)
A: While SSR can improve initial content visibility, it might slightly delay TTI as the browser needs to load and hydrate the JavaScript after receiving the initial HTML.
Q: Are there any security considerations specific to SSR?
A: Yes, with SSR, you need to be more careful about exposing sensitive data or APIs on the server side. Always sanitize user inputs and be cautious about what data you include in the initial render.
Q: How does SSR work with authentication and personalized content?
A: SSR can work with authentication, but it requires careful handling. You might need to implement techniques like JWT tokens or server-side sessions to manage authenticated SSR requests.
↗ Original-Artikel auf dev.to lesenVollständiger Original-BerichtAusführliche Details, Code-Beispiele & Hersteller-Stellungnahme auf dev.to.
This approach gives you the benefits of SSR without having to manually set up a server or manage the rendering process yourself.
Higher-level SSR solutions
If you don't want to reinvent the wheel, there are several frameworks that handle SSR complexities for you. Here's a rundown of popular options across different ecosystems:
SOCIAL SHARE CARD GENERATOR