Update server.js

server.js

@@ -53,7 +53,7 @@ app.post('/generate', generateLimiter, async (req, res) => {
   try {
     const response = await axios.post('https://api.openai.com/v1/images/generations', {
       messages: [{'role': 'system', 'content': start}, {'role': 'system', 'content': prompt}],
-      max_tokens: 2000,
+      max_tokens: '2000',
       model: "gpt-4-1106-preview",
     }, {
       headers: {