SSR in Next.js

SSR stands for Server-Side Rendering, which is a technique to render web pages on the server before sending them to the client. Next.js is a popular React framework that supports SSR out-of-the-box.

In Next.js, SSR is achieved through the use of server-side rendering methods like "getServerSideProps" and "getStaticProps".

"getServerSideProps" is a function that runs on the server side and is used to fetch data and pass it as props to a page component. The data fetched by getServerSideProps can be different for each request, making it ideal for rendering dynamic content.

Here's an example of using getServerSideProps in Next.js:

getStaticProps is another server-side rendering method used in Next.js. It is used to fetch data at build time and pass it as props to a page component. This method is ideal for rendering content that doesn't change frequently.

Difference with react.js

Here's an example that shows the difference between SSR in Next.js and React:

Consider a simple React application that renders a list of posts fetched from an external API:

Now, let's implement the same component using Next.js and SSR:

"The key difference between the two examples is that the first example fetches data on the client side and re-renders the component, while the second example fetches data on the server side and sends the rendered HTML to the client. This means that the second example is faster, more SEO-friendly, and provides a better user experience, especially on slower connections."

In summary, Next.js provides powerful SSR capabilities that enable you to create fast and SEO-friendly web applications. By rendering your application on the server and sending the rendered HTML to the client, you can improve your application's performance and provide a better user experience for your users.