What could be causing the issue of only the title being visible and not the content in Next.js when using next-mdx-remote?

I am having an issue with rendering MDX content on a page using next-mdx-remote with Next.js. Currently, only the title from the frontmatter is being displayed, while the actual MDX content is not showing up. Below is the code snippet showcasing my setup:

PostPage.tsx

import { MDXRemote, MDXRemoteSerializeResult } from 'next-mdx-remote/rsc';
import { getPostBySlug } from '../../../lib/mdx';

export interface Props {
  source: MDXRemoteSerializeResult;
  frontmatter: {
    title: string;
    date: string;
  };
}

export default async function PostPage() {
  const { source, frontmatter } = await getPostBySlug();
  console.log('MDX Source:', source);
  console.log('Frontmatter:', frontmatter);

  return (
    <div className="pt-16">
      <h1>{frontmatter.title}</h1>
      <MDXRemote source={source} />
    </div>
  );
}

lib/mdx.js

import { serialize } from 'next-mdx-remote/serialize';
import { promises as fs } from 'fs';
import matter from 'gray-matter';
import path from 'path';

const postsDirectory = path.join(process.cwd(), 'content/biography');

export async function getPostBySlug() {
  const filePath = path.join(postsDirectory, `life.mdx`);
  const mdxText = await fs.readFile(filePath, 'utf8');

  // Parse the front matter and content
  const { content, data } = matter(mdxText);

  // Serialize the content
  const mdxSource = await serialize(content, { scope: data });
  console.log('Serialized MDX Source:', mdxSource);

  return {
    source: mdxSource,
    frontmatter: data,
  };
}

export async function getAllPostSlugs() {
  const filenames = await fs.readdir(postsDirectory);
  return filenames.map((filename) => filename.replace('.mdx', ''));
}

life.mdx in content/biography

---
title: "Example Post"
date: "2023-01-01"
---

# Hello, world!

This is an example post written in MDX.

next.config.mjs

import remarkGfm from 'remark-gfm';
import createMDX from '@next/mdx';

const nextConfig = {
  // Configure `pageExtensions`` to include MDX files
  pageExtensions: ['js', 'jsx', 'mdx', 'ts', 'tsx'],
  // Optionally, add any other Next.js config below
};

const withMDX = createMDX({
  // Add markdown plugins here, as desired
  options: {
    remarkPlugins: [remarkGfm],
    rehypePlugins: [],
  },
});

export default withMDX(nextConfig);

When accessing the PostPage through the /about route, only the title "Example Post" is visible, and the content (e.g., "# Hello, world!") is not rendering. How can I resolve this issue and display the MDX content correctly?

Answer №1

I encountered an issue related to React Server Components (RSC) handling. Here's the solution I implemented:

Steps to Resolve

Update the function getPostBySlug to Return Raw MDX Content:

Instead of using next-mdx-remote/serialize to serialize the MDX content, directly return the raw MDX content. This is necessary for React Server Components.

import { promises as fs } from 'fs';
import path from 'path';

const postsDirectory = path.join(process.cwd(), 'content/biography');

export async function getPostBySlug(slug: string) {
    const postFilePath = path.join(postsDirectory, `${slug}.mdx`);
    const fileContent = await fs.readFile(postFilePath, 'utf8');
    return fileContent;
}

Compile MDX Content with Frontmatter Parsing:

Utilize the compileMDX function to compile the MDX content and parse the frontmatter.

import { compileMDX } from 'next-mdx-remote/rsc';
import { useMDXComponents } from 'next-mdx-remote';

export default async function PostPage({ params }: { params: { slug: string } }) {
    const source = await getPostBySlug(params.slug);
    const components = useMDXComponents({});
    const { content, frontmatter } = await compileMDX<{ title: string, date: string }>({
        source: source,
        components: components,
        options: {
            parseFrontmatter: true,
        },
    });

    return (
        <div className="pt-16">
            <h1>{frontmatter.title}</h1>
            <div className="prose-strong:text-gray-900 dark:prose-em:text-slate-400 dark:prose-strong:text-slate-400 prose-em:text-gray-900">
                {content}
            </div>
        </div>
    );
}

Ensure Correct Configuration:

Verify that your next.config.mjs is configured properly to support MDX files and plugins.

import remarkGfm from 'remark-gfm';
import createMDX from '@next/mdx';

const nextConfig = {
    pageExtensions: ['js', 'jsx', 'mdx', 'ts', 'tsx'],
};

const withMDX = createMDX({
    options: {
        remarkPlugins: [remarkGfm],
        rehypePlugins: [],
    },
});

export default withMDX(nextConfig);

Summary

Adjust the getPostBySlug function to return raw MDX content and utilize compileMDX for compilation and frontmatter parsing.

Following these steps allowed me to correctly display both the frontmatter title and the MDX content.

References

next-mdx-remote Documentation - React Server Components (RSC)

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