MDX Blog with Next.js 13 and Contentlayer (Part 2)

Minh-Tri Le

Minh-Tri Le on Jan 25, 2023







If you not follow Part 1 to seting up project, you can check here.

Part 2: Setup Contentlayer SDK configurations

Install Contentlayer

yarn add contentlayer next-contentlayer
To hook Contentlayer into the next dev and next build processes, you'll want to wrap the Next.js configuration using the withContentlayer method.
Create a new file called next.config.mjs in the root of your project, and add the following content.
import { withContentlayer } from 'next-contentlayer';
export default withContentlayer({
  experimental: {
    appDir: true,
Then add the following lines to your tsconfig.json or jsconfig.json file:
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "contentlayer/generated": ["./.contentlayer/generated"],
      "~/*": ["./*"]
  "include": [
We defined the baseUrl in the code above to simplify file imports. Then we specified the path where Contentlayer generates files after processing: the .contentlayer/generated directory. This creates an alias of contentlayer/generated to the generated files directory.

Define Post Schema

Create a new file called contentlayer.config.js and add the following below.
import { defineDocumentType, makeSource } from "contentlayer/source-files";
export const Post = defineDocumentType(() => ({
  name: "Post",
  filePathPattern: `**/*.mdx`,
  contentType: "mdx",
  fields: {
    title: {
      type: "string",
      description: "The title of the post",
      required: true,
    date: {
      type: "date",
      description: "The date of the post",
      required: true,
    excerpt: {
      type: "string",
      description: "Short summary of the post",
      required: true,
    tags: {
      type: "list",
      of: { type: "string" },
      description: "Tags for the post",
      required: true,
  computedFields: {
    url: {
      type: "string",
      resolve: (post) => `/blog/${post._raw.flattenedPath}`,

export default makeSource({
  contentDirPath: "posts",
  documentTypes: [Post],
These documents are expected to be .mdx files that live within a posts directory in your project. And data objects generated from these files will have the following properties:
  • title: String pulled from the file's frontmatter.
  • date: JavaScript Date object, pulled from the file's frontmatter.
  • excerpt: Short summary of the article.
  • tag: Define tags for article
  • body: An object that contains the raw content from the markdown file and the converted html string. (This is built into Contentlayer by default and does not have to be defined.)
  • url: A string that takes the name of the file and prepends /blog/ to it, thus defining that path at which that content will be available on your site.

Adding new blog articles in MDX

Create a posts folder where the content (MDX) files will reside. Then add the MDX files. Here is an example of an article at /posts/first-post.mdx.
├── first-post.mdx
├── second-post.mdx
└── third-post.mdx
title: Lorem Ipsum
excerpt: Lorem Ipsum gose here
date: 2023-03-24
  - next.js
  - mdx
  - blog
  - typescript
  - react
  - markdown

Ullamco et nostrud magna commodo nostrud occaecat quis pariatur id ipsum. Ipsum
consequat enim id excepteur consequat nostrud esse esse fugiat dolore.
Reprehenderit occaecat exercitation non cupidatat in eiusmod laborum ex eu
fugiat aute culpa pariatur. Irure elit proident consequat veniam minim ipsum ex

Mollit nisi cillum exercitation minim officia velit laborum non Lorem
adipisicing dolore. Labore commodo consectetur commodo velit adipisicing irure
dolore dolor reprehenderit aliquip. Reprehenderit cillum mollit eiusmod
excepteur elit ipsum aute pariatur in. Cupidatat ex culpa velit culpa ad non
labore exercitation irure laborum.

Date Formatting Helper

Before we get into the pages, add a library to help us with formatting the date.
yanr add date-fns
Now we can tie it all together by bringing the data into our pages. Our next step will be to construct the web page where we will display our blog. Part 3