Electron: cannot find module error, how to fix?

I was trying to write a simple desktop app with electron and nodejs. The code is simple as shown below.

 const {app, BrowserWindow} = require('electron');

 // Global reference of the window object.
 let mainWindow;

 app.on('ready', () => {
   mainWindow = new BrowserWindow({ width: 700, height: 600 });
   mainWindow.loadURL(`file://${__dirname}/index.html`);

   mainWindow.openDevTools();

});

within "index.html"

  <script>require('./model.js')</script>

I used knockout binding as follows.

  function AppViewModel() 
  {
    // some bindings here ..

    this.generate = function()
    {
     if(...)
      {
        this.hint("Please fill all fields!");
        return;
      }
      else
      {
        var json2csv = require('json2csv'); //cannot find this 
        // planning to use json2csv 
        ...
      }    
  };
 }

 ko.applyBindings(new AppViewModel());

This was working until I try to use "json2csv" in "generate" function. it just keep saying cannot find it "json2csv".

I tried some solutions people suggested, but none worked. I tried to load different modules there, it keep saying could not find them. How can I fix that problem and use "json2csv"?

Thanks in advance!

via alim