title: How to install create-react-app through terminal
body: <p>I am installing create-react-app through terminal. I have checked the node.js version is 4.5.0, which is higher than the requirement <a href="https://facebook.github.io/react/blog/2016/07/22/create-apps-with-no-configuration.html" rel="noreferrer">here</a>. and the version of npm is 2.15.9. Then I type the command <code>npm install -g create-react-app</code>, there came out such error information: </p>
  
  <pre><code>npm ERR! tar.unpack untar error /Users/xiufenxu/.npm/create-react-app/0.6.0/package.tgz
  npm ERR! Darwin 16.0.0
  npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "create-react-app"
  npm ERR! node v4.5.0
  npm ERR! npm  v2.15.9
  npm ERR! path /usr/local/lib/node_modules/create-react-app
  npm ERR! code EACCES
  npm ERR! errno -13
  npm ERR! syscall mkdir
  
  npm ERR! Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/create-react-app'
  npm ERR!     at Error (native)
  npm ERR!  { [Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules/create-react-app']
  npm ERR!   errno: -13,
  npm ERR!   code: 'EACCES',
  npm ERR!   syscall: 'mkdir',
  npm ERR!   path: '/usr/local/lib/node_modules/create-react-app',
  npm ERR!   fstream_type: 'Directory',
  npm ERR!   fstream_path: '/usr/local/lib/node_modules/create-react-app',
  npm ERR!   fstream_class: 'DirWriter',
  npm ERR!   fstream_stack:
  npm ERR!    [ '/usr/local/lib/node_modules/npm/node_modules/fstream/lib/dir-writer.js:35:25',
  npm ERR!      '/usr/local/lib/node_modules/npm/node_modules/mkdirp/index.js:47:53',
  npm ERR!      'FSReqWrap.oncomplete (fs.js:82:15)' ] }
  npm ERR!
  npm ERR! Please try running this command again as root/Administrator.
  
  npm ERR! Please include the following file with any support request:
  npm ERR!     /Users/xiufenxu/Documents/UM courses/Fall 2016/CSCI 5117/npm-debug.log
  </code></pre>
  
  <p>I wondering why I got such errors. Is there anyone who can help me to figure out this problem? Thank you so much!</p>