index.js

import { Client } from "@notionhq/client";
import { NotionToMarkdown } from "notion-to-md";
import { config } from "dotenv";
import fs from "fs/promises";

config();

const notion = new Client({ auth: process.env["NOTION_KEY"] });

const databaseId = process.env["NOTION_DATABASE_ID"];

// set this to whatever directory you want to export markdown files
const MARKDOWN_DIR = "./hugo-site";

export async function downloadMarkdown() {
  const n2m = new NotionToMarkdown({
    notionClient: notion,
    staticFileDir: "hugo-site/static",
  });

  if (!databaseId)
    throw Error("Missing NOTION_DATABASE_ID environment variable.");

  // Query the blog database
  const res = await notion.databases.query({
    database_id: databaseId,
  });

  console.log("Downloading Pages from Notion....");

  await Promise.all(
    res.results.map(async (r) => {
      const pageData = await notion.pages.retrieve({ page_id: r.id });

      // @ts-ignore: JSON data is not typed in pageData
      const tags = pageData?.properties?.Tags?.multi_select.map((t) => t.name);

      // @ts-ignore: JSON data is not typed in pageData
      const author = pageData?.properties?.Authors?.people[0]?.name;

      // @ts-ignore: JSON data is not typed in pageData
      const title = pageData?.properties?.Name?.title[0]?.plain_text;

      if (!title) {
        return;
      }

      // @ts-ignore: JSON data is not typed in pageData
      const publishedOn = pageData?.properties["Published On"].date?.start;

      const slugifiedTitle =
        title?.split(" ").join("-").toLowerCase() ?? "title";

      const mdBlocks = await n2m.pageToMarkdown(r.id);

      const mdString = n2m.toMarkdownString(mdBlocks);

      // Front Matter is in TOML
      const hugoHeader = `+++
title = "${title}"
date = "${publishedOn}"
author = "${author ?? "Anonymous"}"
tags = ["${tags.join('", "')}"]
+++`;

      await fs.writeFile(
        `${MARKDOWN_DIR}/content/${slugifiedTitle || r.id}.md`,
        hugoHeader + mdString.parent,
        "utf8",
      );
    }),
  );
}

await downloadMarkdown();