How do I install Angular 2 using NPM?

at https://angular.io/docs/ts/latest/guide/setup.html, is recommended to use QuickStart seed, here is its package.json, so actually we need to download its dependencies:

"dependencies": {
  "@angular/common": "~2.4.0",
  "@angular/compiler": "~2.4.0",
  "@angular/core": "~2.4.0",
  "@angular/forms": "~2.4.0",
  "@angular/http": "~2.4.0",
  "@angular/platform-browser": "~2.4.0",
  "@angular/platform-browser-dynamic": "~2.4.0",
  "@angular/router": "~3.4.0",

  "angular-in-memory-web-api": "~0.2.4",
  "systemjs": "0.19.40",
  "core-js": "^2.4.1",
  "rxjs": "5.0.1",
  "zone.js": "^0.7.4"
}

you could also create your custom package.json, by running npm init, copying these dependencies (or most of them) and than running npm install with your package.json