How to build a sitemap in Express.js?

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const router = express.Router();
const { SitemapStream } = require('sitemap');
const { createGzip } = require('zlib');

router.get('/sitemap.xml', async (req, res, next) => {
    try {
        // Create a new sitemap object
        const sitemap = new SitemapStream({ hostname: 'https://example.com' });
        
        // Add URLs to the sitemap
        sitemap.write({ url: '/' });
        sitemap.write({ url: '/page1' });
        sitemap.write({ url: '/page2' });
        
        // End the sitemap stream
        sitemap.end();
        
        // Pipe the sitemap to the response
        res.header('Content-Type', 'application/xml');
        res.header('Content-Encoding', 'gzip');
        const pipeline = sitemap.pipe(createGzip());
        pipeline.pipe(res).on('error', (e) => { throw e; });
    } catch (err) {
        next(err);
    }
});

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app.use('/', router);