wsDemo/server/package.json

{
  "name": "server",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev": "nodemon index.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.16.3",
    "protobufjs": "^6.8.6",
    "socket.io": "^2.1.1",
    "ws": "^6.0.0"
  }
}