Next.js is a free and open-source React framework that helps developers create server-rendered applications. It is a popular choice among developers because of its features like Automatic code splitting, Static site generation, Optimized bundles, Simple client-side routing, and Universal pre rendering.

One of the most interesting features of Next.js is its ability to dynamically render data on the server-side using the getServerSideProps() method. This method allows you to fetch data from an API or a database and render it on the server-side before the page is sent to the client.

This is especially useful for creating dynamic pages that require data from external sources. For example, if you were creating a blog site, you could use getServerSideProps() to fetch the latest blog posts from a database and render them on the server-side.

The getServerSideProps() method takes a single argument, which is an object with two properties:

The pathname of the page being rendered.
The query string parameters of the page being rendered.

The getServerSideProps() method must return an object with a props property. This props property will be merged with the props of the page component.

Here is an example of how you could use getServerSideProps() to fetch data from an API and render it on the server-side:

function Page({ data }) {
  return (
    <div>
      {data.map(item => (
        <div key={item.id}>
          {item.title}
        </div>
      ))}
    </div>
  )
}

export default Page

export async function getServerSideProps() {
  // Fetch data from an external API
  const res = await fetch('https://api.example.com/posts')
  const data = await res.json()

  // Return the response as the props of the page component
  return { props: { data } }
}```



In this example, we are fetching data from an external API and returning it as the props of the page component. We are also using the async/await syntax to make the code easier to read.

getServerSideProps() is a powerful method that allows you to create dynamic pages that are rendered on the server-side. This is especially useful for pages that require data from external sources.

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