diff --git a/service/chatgpt.ts b/service/chatgpt.ts
new file mode 100644
index 0000000..874d6d7
--- /dev/null
+++ b/service/chatgpt.ts
@@ -0,0 +1,19 @@
+import dotenv from 'dotenv'
+import { ChatGPTAPI } from 'chatgpt'
+
+dotenv.config()
+
+const apiKey = ''
+
+/**
+ * More Info: https://github.com/transitive-bullshit/chatgpt-api
+ */
+const api = new ChatGPTAPI({ apiKey: process.env.OPENAI_API_KEY || apiKey })
+
+async function chatReply(message: string) {
+  if (!message)
+    return
+  return await api.sendMessage(message)
+}
+
+export { chatReply }
diff --git a/service/index.ts b/service/index.ts
index f3cd600..ce7df19 100644
--- a/service/index.ts
+++ b/service/index.ts
@@ -1,30 +1,10 @@
-import dotenv from 'dotenv'
-import { ChatGPTAPI } from 'chatgpt'
 import express from 'express'
-
-dotenv.config()
+import { chatReply } from './chatgpt'
 
 const app = express()
 
 app.use(express.json())
 
-async function chatAPI(message: string) {
-  if (!message)
-    throw new Error('Message is not defined')
-
-  if (!process.env.OPENAI_API_KEY)
-    throw new Error('OPENAI_API_KEY is not defined in .env file')
-
-  try {
-    const api = new ChatGPTAPI({ apiKey: process.env.OPENAI_API_KEY })
-    const res = await api.sendMessage(message)
-    return res
-  }
-  catch (error) {
-    return error
-  }
-}
-
 app.all('*', (req, res, next) => {
   res.header('Access-Control-Allow-Origin', '*')
   res.header('Access-Control-Allow-Headers', 'Content-Type')
@@ -36,6 +16,6 @@ app.listen(3002, () => globalThis.console.log('Server is running on port 3002'))
 
 app.post('/chat', async (req, res) => {
   const { message } = req.body
-  const response = await chatAPI(message)
+  const response = await chatReply(message)
   res.send(response)
 })