Vercel Config - ( NodeJS and Express App )

vercel.json

{
    "name": "",
    "version": 2,
    "builds": [
      {
        "src": "app.js",
        "use": "@vercel/node"
      }
    ],
    "routes": [
      {
        "src": "/(.*)",
        "dest": "app.js"
      }
    ]
  }