Create XML sitemap for Next.js projects

create-nextjs-sitemap.js

#! /usr/bin/env node

const path = require('path');
const glob = require('glob');
const fs = require('fs');

const SITE_ROOT = 'https://example.com';
const SOURCE = path.join(__dirname, '..', 'pages', '/**/*.js');
const DESTINATION = path.join(__dirname, '..', 'static', 'sitemap.xml');

let diskPages = glob.sync(SOURCE);

let xml = '';
xml += '<?xml version="1.0" encoding="UTF-8"?>';
xml += '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">';

diskPages.forEach((page) => {
  let stats = fs.statSync(page);
  let mod = new Date(stats.mtime);
  let lastMod = `${mod.getFullYear()}-${('0' + (mod.getMonth() + 1)).slice(-2)}-${('0' + mod.getDate()).slice(-2)}`;

  page = page.replace(path.join(__dirname, '..', 'pages'), '');
  page = page.replace(/.js$/, '');

  if (page !== '/_app' && page !== '/_document') {
    const priority = page === '/index' ? '1.0' : '0.5';
    page = `${SITE_ROOT}${page}`;

    if (page.match(/.*\/index$/)) {
      page = page.replace(/(.*)index$/, '$1');
    }

    xml += '<url>';
    xml += `<loc>${page}</loc>`;
    xml += `<lastmod>${lastMod}</lastmod>`;
    xml += `<changefreq>always</changefreq>`;
    xml += `<priority>${priority}</priority>`;
    xml += '</url>';
  }
});

xml += '</urlset>';

fs.writeFileSync(DESTINATION, xml);

console.log(`Wrote sitemap for ${diskPages.length} pages to ${DESTINATION}`);