title: Extension installation error: Please install nodejs 5+ and npm before continuing installation
body: <p>While trying to embed bokeh plots in jupyterlab. I used their recommended codes (below)</p>
  
  <p><code>jupyter labextension install @jupyter-widgets/jupyterlab-manager, jupyter labextension install @bokeh/jupyter_bokeh</code></p>
  
  <blockquote>
    <p>Error: File "", line 1
        jupyter labextension install @jupyter-widgets/jupyterlab-manager
                ^
        SyntaxError: invalid syntax</p>
  </blockquote>
  
  <p>Then using jupyterlab extension manger I again tried to install <code>jupyterlab-manager</code> but then <code>Error: Please install nodejs 5+ and npm before continuing installation. nodejs may be installed using conda or directly from the nodejs website.</code></p>
  
  <p>I then tried to install nodejs and then wheel using <code>pip install nodejs and npm</code> but to no avail. Same error was repeated</p>
  
  <blockquote>
    <p>Error: Please install nodejs 5+ and npm before continuing installation. nodejs may be installed using conda or directly from the nodejs website</p>
  </blockquote>
  
  <p>I installed bokeh using <code>pip install jupyter-bokeh</code> and I am using jupyterlab. I am not using conda. And operating system is windows</p>
  
  <p>I am new to programming. Your step-by-step solution will be high appreciated. </p>