working

viewer/server.js

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+const express = require('express');
+const path = require('path');
+const fs = require('fs');
+const markdownIt = require('markdown-it');
+
+const app = express();
+const PORT = 8100;
+const MD_ROOT = path.resolve(__dirname, '..'); // serve the workspace root
+const md = markdownIt({html:true, linkify:true, typographer:true});
+
+// Serve static assets (client side)
+app.use('/', express.static(path.join(__dirname, 'public')));
+
+// API: list directory tree (relative to workspace root)
+app.get('/api/tree', (req, res) => {
+  const rel = req.query.path || '';
+  const absPath = path.join(MD_ROOT, rel);
+  fs.readdir(absPath, {withFileTypes: true}, (err, entries) => {
+    if (err) return res.status(500).json({error: err.message});
+    const items = entries.map(e => ({
+      name: e.name,
+      path: path.join(rel, e.name).replace(/\\/g,'/'),
+      type: e.isDirectory() ? 'dir' : (e.isFile() && e.name.endsWith('.md') ? 'file' : 'other')
+    })).filter(i => i.type !== 'other'); // hide non‑md files
+    res.json(items);
+  });
+});
+
+// API: get markdown content and render HTML
+app.get('/api/md', (req, res) => {
+  const rel = req.query.path;
+  if (!rel) return res.status(400).json({error: 'path is required'});
+  const absPath = path.join(MD_ROOT, rel);
+  if (!absPath.startsWith(MD_ROOT)) return res.status(400).json({error: 'invalid path'});
+  fs.readFile(absPath, 'utf8', (err, data) => {
+    if (err) return res.status(404).json({error: err.message});
+    const html = md.render(data);
+    res.json({html});
+  });
+});
+
+app.listen(PORT, () => {
+  console.log(`🗂️  Markdown viewer running at http://localhost:${PORT}`);
+});