How to parse Markdown in Next.js

Jun 28, 2021

Learn how to parse Markdown in Next.js using marked, dompurify, and jsdom, running DOMPurify.sanitize() inside getStaticProps so it works server-side in Node.

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I had a field with markdown and I wanted to print it in a Next.js page.

I used marked, dompurify and jsdom. Here’s an example in a Next.js dynamic page, to render an item’s description.

Note that I had to call DOMPurify.sanitize() server-side, as it assumes we’re in a Node.js environment, so I put it into getStaticProps():

import { useState, useEffect } from 'react'
import Head from 'next/head'
import Link from 'next/link'
import { useRouter } from 'next/router'
import { getJob, getJobs } from 'lib/data.js'
import prisma from 'lib/prisma'
import marked from 'marked'
import createDOMPurify from 'dompurify'
import { JSDOM } from 'jsdom'

export default function Item({ item }) {
  return <p>{item.description}</p>
}

export async function getStaticPaths() { //data fetching
  const items = await getItems(prisma)

  return {
    paths: items.map(job => ({
      params: {
        id: String(item.id),
      },
    })),
    fallback: false,
  }
}

export async function getStaticProps({ params }) {
  const id = String(params.id)
  const item = await getItem(prisma, id) //unrelated

  const window = new JSDOM('').window
  const DOMPurify = createDOMPurify(window)
  item.description = DOMPurify.sanitize(marked(item.description))

  return { props: { item } }
}

Tagged: Next.js · All topics

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