Update server.js

server.js

@@ -15,14 +15,16 @@ function getSessionFile(sessionId) {
 
 async function gemini(sessionId, prompt) {
     const sessionFile = getSessionFile(sessionId);
-    let session;
+    let chatSession;
     if (fs.existsSync(sessionFile)) {
-        session = JSON.parse(fs.readFileSync(sessionFile, 'utf8'));
+        chatSession = JSON.parse(fs.readFileSync(sessionFile, 'utf8'));
     } else {
-        session = await genAI.getGenerativeModel({ model: 'gemini-2.0-flash' }).startChat();
+        chatSession = await genAI.getGenerativeModel({ model: 'gemini-2.0-flash' }).startChat();
     }
-    const result = await session.sendMessage(prompt);
-    fs.writeFileSync(sessionFile, JSON.stringify(session));
+    
+    const result = await chatSession.sendMessage(prompt);
+    
+    fs.writeFileSync(sessionFile, JSON.stringify(chatSession.history, null, 2));
     return result.response.text();
 }
 
@@ -31,9 +33,9 @@ app.get('/gemini', async (req, res) => {
         const { question, sessionId } = req.query;
         if (!question || !sessionId) return res.status(400).json({ error: 'Missing parameters' });
         const reply = await gemini(sessionId, question);
-        res.json({ reply });
+        res.json({ reply }, null, 2);
     } catch (error) {
-        res.status(500).json({ error: error.message });
+        res.status(500).json({ error: error.message }, null, 2);
     }
 });