How to build a blog with Next.js and MDX

Preface

The packages to be used:

next Next.js framework
next-mdx-remote handling and loading mdx content
gray-matter parse the front matter in markdown

How to create a blog

First, we create the Next.js project with the following command:

yarn create next-app nextjs-mdx-blog

Next, create the following file structure:

components/layout.jsx - Wrap all components in a container (optional, just the style)
data/blog/*.mdx - Blog Articles
lib/format-date.js - Format the date as MM DD, YYYY
pages/blog/[slug].jsx - Article page, using dynamic routes

How to handle Markdown files

First, const root - the root directory, and the process.cwd() method returns the current working directory of the Node.js process.

const root = process.cwd()

Next, create the POSTS_PATH constant for the path where the article files are stored:

import path from "path"
 
const POSTS_PATH = path.join(root, "data", "blog")
// Output: A:/nextjs-mdx-blog/data/blog

Then use fs to read the contents of that directory (all the file names under data/blog):

import fs from "fs"
 
export const allSlugs = fs.readdirSync(POSTS_PATH)
// Output: ['markdown.mdx', 'nextjs.mdx', 'react.mdx']

Now, write a function to remove the file extension (useful later):

export const formatSlug = slug => slug.replace(/\.mdx$/, "")
/**
 * Example: formatSlug('markdown.mdx')
 * Output: 'markdown'
 */

The next step is to get the article content by slug:

export const getPostBySlug = async slug => {
  const postFilePath = path.join(POSTS_PATH, `${slug}.mdx`)
  // Output: A:/nextjs-mdx-blog/data/blog/slug.mdx
  const source = fs.readFileSync(postFilePath)
 
  const { content, data } = matter(source)
  /*
   * Example:
   *  ---
   *  title: Hello
   *  slug: home
   *  ---
   *  <h1>Hello world!</h1>
   *
   * Return:
   *  {
   *    content: '<h1>Hello world!</h1>',
   *    data: {
   *      title: 'Hello',
   *      slug: 'home'
   *    }
   *  }
   */
 
  const mdxSource = await serialize(content)
 
  const frontMatter = {
    ...data,
    slug,
  }
 
  return {
    source: mdxSource,
    frontMatter,
  }
}

Get all blog posts

You can get all the articles to be displayed on the homepage:

export const getAllPosts = () => {
  const frontMatter = []
 
  allSlugs.forEach(slug => {
    const source = fs.readFileSync(path.join(POSTS_PATH, slug), "utf-8")
    const { data } = matter(source)
 
    frontMatter.push({
      ...data,
      slug: formatSlug(slug),
      date: new Date(data.date).toISOString(),
    })
  })
 
  return frontMatter.sort((a, b) => dateSortDesc(a.date, b.date))
}
 
const dateSortDesc = (a, b) => {
  if (a > b) return -1
  if (a < b) return 1
  return 0
}

Formatting Date

export const formatDate = date =>
  new Date(date).toLocaleDateString("en", {
    year: "numeric",
    month: "long",
    day: "numeric",
  })
/*
 * formatDate('2022-08-21T00:00:00Z')
 * Output: 'August 21, 2022'
 */

Home Page

import { formatDate } from "../lib/format-date"
import { getAllPosts } from "../lib/mdx"
import Link from "next/link"
 
export default function Home({ posts }) {
  return (
    <>
      <h1 className="mb-8 text-6xl font-bold">Blog</h1>
      <hr className="my-8" />
      <ul className="flex flex-col gap-3">
        {posts.map(({ slug, title, summary, date }) => (
          <li key={slug}>
            <Link href={`/blog/${slug}`}>
              <a className="block rounded-lg border border-solid border-gray-300 p-6 shadow-md">
                <div className="flex justify-between">
                  <h2>{title}</h2>
                  <time dateTime={date}>{formatDate(date)}</time>
                </div>
                <p className="mt-4">{summary}</p>
              </a>
            </Link>
          </li>
        ))}
      </ul>
    </>
  )
}
 
// Use getStaticProps to get all articles
export const getStaticProps = async () => {
  const posts = getAllPosts()
 
  return {
    props: {
      posts,
    },
  }
}

Article Page

import { formatDate } from "../../lib/format-date"
import { allSlugs, formatSlug, getPostBySlug } from "../../lib/mdx"
import { MDXRemote } from "next-mdx-remote"
 
export default function Blog({ post }) {
  const { title, date } = post.frontMatter
 
  return (
    <div>
      <h1 className="mb-2 text-6xl font-bold">{title}</h1>
      <time dateTime={date} className="text-lg font-medium">
        {formatDate(date)}
      </time>
      <hr className="my-8" />
      <article className="prose max-w-none">
        <MDXRemote {...post.source} />
      </article>
    </div>
  )
}
 
export const getStaticProps = async ({ params }) => {
  const post = await getPostBySlug(params.slug)
 
  return {
    props: {
      post,
    },
  }
}
 
export const getStaticPaths = async () => {
  const paths = allSlugs.map(slug => ({
    params: {
      slug: formatSlug(slug),
    },
  }))
 
  return {
    paths,
    fallback: false,
  }
}

How to build a blog with Next.js and MDX

Preface

How to create a blog

How to handle Markdown files

Get all blog posts

Formatting Date

Home Page

Article Page

Useful Links

On this page

FROM CONCEPT TO CREATION

LET's MAKE IT HAPPEN!

On this page

Contact Drawer

FROM CONCEPT TO CREATION

LET's MAKE IT HAPPEN!