Render Markdown

To render markdown content, we’ll use the remark library. First, let’s install it:

npm install remark remark-html

Then, open lib/posts.js and add the following imports to the top of the file:

import { remark } from 'remark';
import html from 'remark-html';

And update the getPostData() function in the same file as follows to use remark:

export async function getPostData(id) {
  const fullPath = path.join(postsDirectory, `${id}.md`);
  const fileContents = fs.readFileSync(fullPath, 'utf8');

  // Use gray-matter to parse the post metadata section
  const matterResult = matter(fileContents);

  // Use remark to convert markdown into HTML string
  const processedContent = await remark()
    .use(html)
    .process(matterResult.content);
  const contentHtml = processedContent.toString();

  // Combine the data with the id and contentHtml
  return {
    id,
    contentHtml,
    ...matterResult.data,
  };
}

Important: We added the async keyword to getPostData because we need to use await for remark. async/await allow you to fetch data asynchronously.

That means we need to update getStaticProps in pages/posts/[id].js to use await when calling getPostData:

export async function getStaticProps({ params }) {
  // Add the "await" keyword like this:
  const postData = await getPostData(params.id);

  return {
    props: {
      postData,
    },
  };
}

Finally, update the Post component in pages/posts/[id].js to render contentHtml using dangerouslySetInnerHTML:

export default function Post({ postData }) {
  return (
    <Layout>
      {postData.title}
      <br />
      {postData.id}
      <br />
      {postData.date}
      <br />
      <div dangerouslySetInnerHTML={{ __html: postData.contentHtml }} />
    </Layout>
  );
}

Try visiting these pages again:

• http://localhost:3000/posts/ssg-ssr
• http://localhost:3000/posts/pre-rendering

You should now see the blog content:

We’re almost done! Let’s polish each page next.