diff --git a/src/routes/datasets.js b/src/routes/datasets.js
new file mode 100644
index 0000000..1c2b753
--- /dev/null
+++ b/src/routes/datasets.js
@@ -0,0 +1,34 @@
+import { Router } from 'express';
+import { join } from 'path';
+import { getProjectPath } from '../utils/paths.js';
+
+const router = Router();
+
+// Environment variables for paths (all relative to project root)
+const DATA_DIR = process.env.DATA_DIR ? getProjectPath(process.env.DATA_DIR) : getProjectPath('data');
+
+const DATASETS = [
+    "comment_generation",
+    "code_refinement"
+];
+
+router.get('/download/:dataset', async (req, res) => {
+    const { dataset } = req.params;
+    const withContext = req.query.withContext ? JSON.parse(req.query.withContext) : false;
+
+    if (!DATASETS.includes(dataset)) {
+        return res.status(400).json({ error: 'Invalid dataset name' });
+    }
+
+    const fileName = `${dataset}_${withContext ? 'with_context' : 'no_context'}.zip`;
+    const filePath = join(DATA_DIR, fileName);
+
+    try {
+        res.download(filePath);
+    } catch (error) {
+        console.error('Error serving file:', error);
+        res.status(500).json({ error: 'Error serving file' });
+    }
+});
+
+export default router; 
diff --git a/src/routes/index.js b/src/routes/index.js
index 1aeab9c..507f994 100644
--- a/src/routes/index.js
+++ b/src/routes/index.js
@@ -1,4 +1,6 @@
 import { Router } from 'express';
+import datasetRoutes from './datasets.js';
+
 const router = Router();
 
 // Routes
@@ -11,4 +13,7 @@ router.get('/api/hello', (_req, res) => {
     res.json({ message: 'Hello from the backend!' });
 });
 
+// Dataset routes
+router.use('/datasets', datasetRoutes);
+
 export default router; 
diff --git a/src/utils/paths.js b/src/utils/paths.js
new file mode 100644
index 0000000..ed828aa
--- /dev/null
+++ b/src/utils/paths.js
@@ -0,0 +1,11 @@
+import { fileURLToPath } from 'url';
+import { dirname, join } from 'path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+// Get the project root directory (2 levels up from src/utils)
+export const PROJECT_ROOT = join(__dirname, '../..');
+
+// Helper function to create paths relative to project root
+export const getProjectPath = (relativePath) => join(PROJECT_ROOT, relativePath); 
\ No newline at end of file