Server-Side Rendering with Next.js Explained
Jul 23, 2025 am 01:39 AM
Server-side rendering (SSR) in Next.js generates HTML on the server for each request, improving performance and SEO. 1. SSR is ideal for dynamic content that changes frequently, such as user dashboards. 2. It uses getServerSideProps to fetch data per request and pass it to the component. 3. Use SSR when data needs to be up-to-date, for user authentication checks, or for SEO purposes. 4. Compared to SSG and CSR, SSR is best for dynamic data but requires more server resources. 5. Potential downsides include server load and slower load times due to waiting for data fetching, which can be mitigated through optimization and caching strategies.
Server-side rendering (SSR) is a powerful feature in Next.js that allows you to generate HTML on the server for each request. This means users get fully rendered pages right away, which can help with performance and SEO compared to client-side rendering.
What Is Server-Side Rendering in Next.js?
In simple terms, SSR in Next.js means your page content is built on the server every time someone visits it. Unlike static generation, where pages are built once and served from a cache, SSR runs your code on every request. That makes it ideal for dynamic content like user dashboards or pages that change frequently.
To use SSR in Next.js, you export a function called getServerSideProps from your page. This function fetches data when the page is requested and passes it as props to your component.
Here’s a basic example:
export async function getServerSideProps() {
const res = await fetch('https://api.example.com/data');
const data = await res.json();
return { props: { data } };
}This way, the page gets fresh data every time it loads — no stale content.
When Should You Use Server-Side Rendering?
You’ll want to use SSR when:
- The data changes often and needs to be up-to-date on every visit.
- You need real-time user authentication checks before showing the page.
- SEO matters and the content must be rendered server-side for search engines to index properly.
For instance, if you're building a dashboard that shows personalized analytics, SSR ensures the numbers are always current without relying on JavaScript to load after the page renders.
Some common use cases include:
- User profiles
- Search result pages
- Pages behind login walls
It's not always the best choice though — if your data doesn’t change much, Static Generation (getStaticProps) might be more efficient.
How Does SSR Compare to Other Rendering Methods?
Next.js gives you several options for rendering: SSR, Static Generation (SSG), and Client-Side Rendering (CSR). Here’s how they stack up:
Static Generation (SSG):
Pages are built at build time and cached. Great for blogs or marketing pages that don't change often.Server-Side Rendering (SSR):
Pages are generated per request. Best for dynamic data but comes with higher server cost.Client-Side Rendering (CSR):
Content loads after JavaScript runs in the browser. Good for interactive apps but hurts SEO and initial load experience.
If you're trying to decide between SSG and SSR, ask yourself: does this page need to show different content on every visit? If yes, go with SSR.
Things to Watch Out For With SSR
One thing many people overlook is that SSR can add load to your server since it runs code on every request. So if you expect high traffic, make sure your backend can handle frequent calls — or consider caching strategies.
Also, because the page waits for getServerSideProps to finish before rendering, slow API calls will directly impact load time. You can speed things up by:
- Optimizing your API endpoints
- Using caching inside
getServerSideProps - Avoiding unnecessary data fetching
Another small gotcha: getServerSideProps only works in pages, not components. So if you're trying to fetch data inside a reusable component, you'll need to do it differently — like using SWR or React Query on the client side.
基本上就這些。
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