.
└── koa-app/
    └── src/
        ├── assets
        ├── boostrap         --- Initialize the database and websocket
        ├── config           --- database and jwt etc. 
        ├── controllers 
        ├── entities
        ├── middlewares      --- middlewares such as jwt, error handle, etc.
        ├── services
        ├── sockets
        ├── types
        ├── utils
        ├── application.ts
        └── index.ts         --- entry

pnpm run dev