Update index.js

index.js

@@ -1,8 +1,13 @@
-const express = require('express');
-const fetch = require('node-fetch');
-const { v4: uuidv4 } = require('uuid');
+import express from 'express';
+import fetch from 'node-fetch';
+import { v4 as uuidv4 } from 'uuid';
+import dotenv from 'dotenv';
+import { Buffer } from 'buffer';
+
+dotenv.config();
+
 const app = express();
-require('dotenv').config();
+
 
 const modelMapping = {
   "gpt-4o-mini": "GPT-4o mini",