title: what does npm install -d --save mean
body: <p>I have recently come across one of these statements in a node project that I am currently working on that we use to install node modules locally</p>
  
  <pre><code>npm install -d --save
  </code></pre>
  
  <p>Can somebody please tell me what it means as earlier we used to use simply npm install</p>
  
  <p>I want to know the difference between the two</p>