After invoking npm install you get repository and license field warnings:

$ npm install
aws-nodejs-sample
├─┬ [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ ├── [email protected]
│ └─┬ [email protected]
│ └── [email protected]
└── [email protected]

npm WARN aws-nodejs-sample No repository field.
npm WARN aws-nodejs-sample No license field.
aws-nodejs-sample$

One solution is in: #4.