.
├── imports                 # root folder
│   ├── api                 #
│   |  └── gql              # graphql query & mutation definitions
│   |  └── schema.js        # graphql schema configration
│   ├── collections         # database layer
│   ├── constants           # app constants
│   ├── utils               # app utility
├── server                  #
│   └── main.js             # main server file initiating apollo server