deploy vercel

backend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "backend",
   "version": "1.0.0",
-  "main": "index.js",
+  "main": "app.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },

backend/vercel.json

@@ -0,0 +1,16 @@
+{
+ "version": 2,
+ "builds": [
+  {
+   "src": "app.js",
+   "use": "@vercel/node",
+   "config": { "includeFiles": ["dist/**"] }
+  }
+ ],
+ "routes": [
+  {
+   "src": "/(.*)",
+   "dest": "app.js"
+  }
+ ]
+}