title: Can't install extensions for JupyterLab because Node.js and npm can't be found
body: <p>I installed Jupyter Lab via pip on a windows machine.</p>
  <p>I installed Node.js via their website and used the wizard they provided.</p>
  <p>I verified Node.js and npm are install on my machine:</p>
  <p><a href="https://i.stack.imgur.com/8PRB9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8PRB9.png" alt="enter image description here" /></a></p>
  <p>Installed via pip, I can verify that flake8 extension is on my machine in the site-packages directory:</p>
  <p><a href="https://i.stack.imgur.com/MnBej.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/MnBej.png" alt="enter image description here" /></a></p>
  <p>However, my &quot;installed&quot; section in Jup-Lab shows nothing - as does labextension list:</p>
  <p><a href="https://i.stack.imgur.com/0SOQW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0SOQW.png" alt="enter image description here" /></a></p>
  <p>If I try to install extensions for Jup-Lab using the extension manager it tells me I have to install nodejs and npm</p>
  <p><a href="https://i.stack.imgur.com/UiE9r.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UiE9r.png" alt="enter image description here" /></a></p>
  <p>I've been searching for hours, but completely lost on how to resolve this.  Please help!</p>