title: node npm install to central location
body: <p>I was wondering if it is possible to do a single installation of node packages that can then be accessed by different development applications.  For example, whenever I'm working on a react app, I do npm install to get all node packages the app needs.  However, it seems that this gets a lot of unneeded extras.  Is there a way </p>
  
  <ol>
  <li>to just get what my app needs as specified in the package file or </li>
  <li>get everything into the node modules folder in the installation folder and access the packages from there without having to reinstall them locally in every app folder.</li>
  </ol>
  
  <p>I'm adding the following since my question is not being answered:
  Let's say I have the following package.json.  If I navigate to my app folder where this package.json file is located and I do <code>npm install</code>, what gets installed and where?  My assumption is that only the packages listed in devDependencies and in dependencies will be installed and that it will be installed locally since I did not specify global.  So why do I see hundreds of other packages (packages not in the list below) when I go into my node_modules folder in my app?</p>
  
  <p>what I would like is to install only the packages listed below and to make them global so that if I go into another app directory I do not have to reinstall these.  </p>
  
  <pre><code>{
    "devDependencies": {
      "babel-eslint": "7.1.1",
      "babel-jest": "18.0.0",
      "concurrently": "3.1.0",
      "enzyme": "2.7.1",
      "eslint": "3.12.1",
      "eslint-config-defaults": "9.0.0",
      "eslint-plugin-react": "6.7.1",
      "jest": "18.1.0",
      "json-server": "0.9.4",
      "react-addons-test-utils": "15.4.2",
      "react-test-renderer": "15.4.2",
      "rimraf": "2.5.4",
      "sass-lint": "1.10.2",
      "tslint": "4.3.1",
      "webpack-dev-server": "2.6.1"
    },
    "dependencies": {
      "bootstrap": "4.0.0-alpha.6",
      "bootstrap-loader": "2.0.0-beta.20",
      "copy-webpack-plugin": "4.0.1",
      "css-loader": "0.26.1",
      "empty": "0.10.1",
      "extract-text-webpack-plugin": "2.0.0-rc.3",
      "file-loader": "0.10.0",
      "html-loader": "0.4.3",
      "html-webpack-plugin": "2.26.0",
      "key-mirror": "1.0.1",
      "lodash": "4.16.2",
      "node-sass": "4.5.0",
      "null-loader": "0.1.1",
      "postcss": "5.2.9",
      "postcss-import": "9.1.0",
      "postcss-loader": "1.2.1",
      "raw-loader": "0.5.1",
      "react": "15.4.2",
      "react-addons-css-transition-group": "15.4.2",
      "react-dom": "15.4.2",
      "react-redux": "5.0.2",
      "react-router": "3.0.0",
      "react-router-redux": "4.0.7",
      "redux": "3.6.0",
      "redux-thunk": "2.1.0",
      "resolve-url-loader": "1.6.1",
      "sass-loader": "5.0.1",
      "style-loader": "0.13.1",
      "ts-loader": "1.3.3",
      "typescript": "2.1.4",
      "url-loader": "0.5.7",
      "webpack": "2.2.1",
      "whatwg-fetch": "2.0.3"
    },
   }
  </code></pre>