main.js

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

let win 

function createWindow () {

    win = new BrowserWindow({width: 800, height: 600})
  
    win.loadURL(
        url.format({
      pathname: path.join(__dirname, 'index.html'),
      protocol: 'file:', //http
      slashes: true
    }))

    win.on('closed', () => {
    
        win = null
      })
    }

    app.on('ready', createWindow)