substack-opml-export/bookmarklet.js at main · a692570/substack-opml-export · GitHub

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/**
 * substack-opml-export
 * Exports your Substack subscriptions as an OPML file.
 *
 * Run this in your browser console at substack.com while logged in.
 * The OPML file will download automatically.
 *
 * Last verified working: April 2026
 */

fetch('/api/v1/subscriptions')
  .then(r => r.json())
  .then(d => {
    const feeds = d.publications.map(p => {
      const base = p.custom_domain
        ? `https://${p.custom_domain}`
        : `https://${p.subdomain}.substack.com`;
      return `    <outline type="rss" text="${p.name.replace(/"/g, '&quot;')}" title="${p.name.replace(/"/g, '&quot;')}" htmlUrl="${base}" xmlUrl="${base}/feed" />`;
    });

    const opml = [
      '<?xml version="1.0" encoding="UTF-8"?>',
      '<opml version="2.0">',
      '<body>',
      '  <outline text="Substack" title="Substack">',
      ...feeds,
      '  </outline>',
      '</body>',
      '</opml>'
    ].join('\n');

    const a = document.createElement('a');
    a.href = URL.createObjectURL(new Blob([opml], { type: 'application/xml' }));
    a.download = 'substack-subscriptions.opml';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);

    console.log(`Downloaded OPML with ${d.publications.length} subscriptions.`);
  })
  .catch(err => {
    console.error('Export failed:', err);
    console.error('Make sure you are logged in at substack.com and run this script from that tab.');
  });