How can I create dynamic routes in a Next.js application and fetch data for each unique page?

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In Next.js, dynamic routing can be implemented using file and folder naming conventions in the pages directory. Here's how you can do it:

Creating Dynamic Routes:

Create a file under the pages directory that uses square brackets to denote a dynamic segment. For example, pages/posts/[id].js.
Inside this file, you export a React component. This component will be rendered when someone navigates to /posts/1, /posts/2, etc.
Fetching Data:

To fetch data for each unique page, use getStaticProps and getStaticPaths functions.
getStaticPaths returns an array of possible values for the dynamic segment. It tells Next.js which HTML pages to generate for your dynamic routes.
getStaticProps fetches necessary data for the blog post with a given id. It runs at build time in production and provides props to your page.
Here's a basic example:

javascript
Copy code
// pages/posts/[id].js
import { useRouter } from 'next/router';

function Post({ postData }) {
  const router = useRouter();
  const { id } = router.query;

  return (
    <div>
      <h1>Post {id}</h1>
      <p>{postData.content}</p>
    </div>
  );
}

export async function getStaticPaths() {
  return {
    paths: [
      { params: { id: '1' } },
      { params: { id: '2' } }
      // Add more paths as needed
    ],
    fallback: false
  };
}

export async function getStaticProps({ params }) {
  // Fetch data based on `id`
  const postData = await fetchData(params.id); // Implement fetchData
  return {
    props: {
      postData,
    },
  };
}

export default Post;
In this example, fetchData is a hypothetical function that you'd replace with your actual data-fetching logic, such as fetching data from an API or a database.

Remember, if your data changes frequently or if you have a large number of pages, you might want to use getServerSideProps for server-side rendering or Incremental Static Regeneration.






1 Answers

In Next.js, dynamic routing can be implemented using file and folder naming conventions in the pages directory. Here's how you can do it:

1. Creating Dynamic Routes:
- Create a file under the pages directory that uses square brackets to denote a dynamic segment. For example, `pages/posts/[id].js`.
- Inside this file, export a React component. This component will be rendered when someone navigates to `/posts/1`, `/posts/2`, etc.

2. Fetching Data:
- To fetch data for each unique page, use `getStaticProps` and `getStaticPaths` functions.
- `getStaticPaths` returns an array of possible values for the dynamic segment. It tells Next.js which HTML pages to generate for your dynamic routes.
- `getStaticProps` fetches necessary data for the blog post with a given ID. It runs at build time in production and provides props to your page.

Here's a basic example:

```javascript
// pages/posts/[id].js
import { useRouter } from 'next/router';

function Post({ postData }) {
const router = useRouter();
const { id } = router.query;

return (




Post {id}



{postData.content}





);
}

export async function getStaticPaths() {
return {
paths: [
{ params: { id: '1' } },
{ params: { id: '2' } }
// Add more paths as needed
],
fallback: false
};
}

export async function getStaticProps({ params }) {
// Fetch data based on `id`
const postData = await fetchData(params.id); // Implement fetchData
return {
props: {
postData,
},
};
}

export default Post;
```

In this example, `fetchData` is a hypothetical function that you'd replace with your actual data-fetching logic, such as fetching data from an API or a database.

Remember, if your data changes frequently or if you have a large number of pages, you might want to use `getServerSideProps` for server-side rendering or Incremental Static Regeneration.

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