Notion Block output from N8N Notion Node to Markdown.

notion_blocks_to_md.js

/* Helper function to extract plain text from a rich_text array */
function parseRichText(richTextArray) {
  if (!richTextArray || !Array.isArray(richTextArray)) return "";
  return richTextArray.map(rt => rt.plain_text).join("");
}

/* Recursively convert a list of notion blocks into a Markdown string */
function convertNotionBlocksToMarkdown(blocks, indentLevel = 0) {
  const indent = " ".repeat(indentLevel); // two spaces per indent level
  let md = "";
  blocks.forEach(block => {
    let text = "";
    switch (block.type) {
      case "paragraph":
        text = block.paragraph?.rich_text ? parseRichText(block.paragraph.rich_text) : block.content;
        break;
      case "heading_1":
        text = "# " + (block.heading_1?.rich_text ? parseRichText(block.heading_1.rich_text) : block.content);
        break;
      case "heading_2":
        text = "## " + (block.heading_2?.rich_text ? parseRichText(block.heading_2.rich_text) : block.content);
        break;
      case "heading_3":
        text = "### " + (block.heading_3?.rich_text ? parseRichText(block.heading_3.rich_text) : block.content);
        break;
      case "bulleted_list_item":
        text = "- " + (block.bulleted_list_item?.rich_text ? parseRichText(block.bulleted_list_item.rich_text) : block.content);
        break;
      case "numbered_list_item":
        text = "1. " + (block.numbered_list_item?.rich_text ? parseRichText(block.numbered_list_item.rich_text) : block.content);
        break;
      case "to_do":
        text = "- [" + (block.to_do?.checked ? "x" : " ") + "] " + (block.to_do?.rich_text ? parseRichText(block.to_do.rich_text) : block.content);
        break;
      case "quote":
        text = "> " + (block.quote?.rich_text ? parseRichText(block.quote.rich_text) : block.content);
        break;
      case "code": {
        const codeLang = block.code?.language || "";
        const codeText = block.code?.rich_text ? parseRichText(block.code.rich_text) : block.content;
        text = "```" + codeLang + "\n" + codeText + "\n```";
        break;
      }
      case "divider":
        text = "---";
        break;
      case "callout": {
        const icon = block.callout?.icon?.emoji ? `${block.callout.icon.emoji} ` : "";
        text = "> " + icon + (block.callout?.rich_text ? parseRichText(block.callout.rich_text) : block.content);
        break;
      }
      case "image": {
        const image = block.image;
        const url = image?.type === "external" ? image.external?.url : image.file?.url;
        const caption = image?.caption ? parseRichText(image.caption) : "";
        text = url ? `![${caption}](${url})` : "";
        break;
      }
      default:
        text = block[block.type]?.rich_text ? parseRichText(block[block.type].rich_text) : block.content;
    }
    if (text !== "") {
      md += indent + text + "\n\n";
    }
    if (block.has_children && Array.isArray(block.children) && block.children.length > 0) {
      md += convertNotionBlocksToMarkdown(block.children, indentLevel + 1);
    }
  });
  return md.trim();
}

for (const item of $input.all()) {
  item.json.markdown = convertNotionBlocksToMarkdown([item.json]);
}

return $input.all();