Hot Reloading is a beloved feature of developers. It allows changes in source code to be instantly reflected in the output/browser without restarting the application. Electron does not provide any built-in hot reloading module.
However, Electron can still use this hot reloading feature via using 3rd-party libraries. In this post, we will implement Hot Reload in an Electron app using electron-reloader package.

Install
npm install electron-reload --save-dev
Add the package to dependencies in package.json
.
"dependencies": { "electron-reload": "^1.5.0" }
We can force the whole app to reload by adding these lines to main.js.
require('electron-reload')(__dirname, { electron: require(`${__dirname}/node_modules/electron`) });
main.js file with other codes
// Modules to control application life and create native browser window const {app, BrowserWindow} = require('electron') const electron = require('electron') const path = require('path') require('electron-reload')(__dirname, { electron: require(`${__dirname}/node_modules/electron`) }); function createWindow () { // Create the browser window. const {width, height} = electron.screen.getPrimaryDisplay().workAreaSize const mainWindow = new BrowserWindow({ width: width, height: height, webPreferences: { preload: path.join(__dirname, 'preload.js'), nodeIntegration: true } }) // and load the index.html of the app. mainWindow.loadFile('index.html') // Open the DevTools. mainWindow.webContents.openDevTools() } // 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.whenReady().then(() => { createWindow() 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 (BrowserWindow.getAllWindows().length === 0) createWindow() }) }) // Quit when all windows are closed, except on macOS. There, it's common // for applications and their menu bar to stay active until the user quits // explicitly with Cmd + Q. app.on('window-all-closed', function () { if (process.platform !== 'darwin') app.quit() })