Small node script that generates a sitemap xml based in a folder and its subfolders (assuming they each represent an individual page). Works well after rendering an SSR generated website.

nuxt-static-sitemap.js

const fs = require("fs");
const path = require("path");

const config = require("./package.json"); // Please add a "url" field to the package.json to serve as base domain
const ignoreFolders = ["_nuxt"]; // Modify if you see fit
const readFolder = "./dist"; // The location where static files are generated
const outputFile = "sitemap.xml" // The location to store the sitemap (placed at the root of the readFolder)

function flatten(lists) {
  return lists.reduce((a, b) => a.concat(b), []);
}

function getDirectories(srcpath) {
  return fs
    .readdirSync(srcpath)
    .filter((path) => !ignoreFolders.includes(path))
    .map((file) => path.join(srcpath, file))
    .filter((path) => fs.statSync(path).isDirectory());
}

function getDirectoriesRecursive(srcpath) {
  return [
    srcpath,
    ...flatten(getDirectories(srcpath).map(getDirectoriesRecursive)),
  ];
}

const grabFolders = (readFolder) =>
  getDirectoriesRecursive(readFolder).map((f) =>
    `${config.url}/`.concat(f.replace("dist/", "")).replace(readFolder, "")
  );

const generateSitemap = (readFolder, outputfile) => {
  const folders = grabFolders(readFolder);
  const today = new Date();
  const formattedDate = today.toISOString().split("T")[0];

  const formattedFolders = folders
    .map(
      (f) => `
    <url>
        <loc>${f}</loc>
        <lastmod>${formattedDate}</lastmod>
    </url>`
    )
    .join("");

  const xml = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${formattedFolders}
</urlset>`;

  fs.writeFile(outputfile, xml, (err) => {
    if (err) {
      console.error(err);
    }
    console.log(`XML file generated at ${outputfile}`);
  });
};

generateSitemap(readFolder, `${readFolder}/${outputFile}`);