main.js

// Modules to control application life and create native browser window
const { app, BrowserWindow } = require("electron");

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow;

function createWindow() {
    // Create the browser window.
    mainWindow = new BrowserWindow({
        width: 1000,
        height: 600,
        frame: false,
        resizable: false,
        icon: __dirname + "/icon.png",
        webPreferences: {
            nodeIntegration: true
        }
    });

    // remove 'x-frame-options' header to allow embedding external pages into an 'iframe'
    mainWindow.webContents.session.webRequest.onHeadersReceived(
        {},
        (details, callback) => {
            if (details.responseHeaders["x-frame-options"]) {
                delete details.responseHeaders["x-frame-options"];
            }
            callback({
                cancel: false,
                responseHeaders: details.responseHeaders
            });
        }
    );

    // and load the index.html of the app.
    mainWindow.loadFile("index.html");

    // Open the DevTools.
    // mainWindow.webContents.openDevTools()

    // Emitted when the window is closed.
    mainWindow.on("closed", function() {
        // Dereference the window object, usually you would store windows
        // in an array if your app supports multi windows, this is the time
        // when you should delete the corresponding element.
        mainWindow = null;
    });
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on("ready", createWindow);

// Quit when all windows are closed.
app.on("window-all-closed", function() {
    // On macOS it is common for applications and their menu bar
    // to stay active until the user quits explicitly with Cmd + Q
    if (process.platform !== "darwin") app.quit();
});

app.on("activate", function() {
    // On macOS it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (mainWindow === null) createWindow();
});

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.