Here is a summary of the provided text in one paragraph: This article provides an introduction to installable web apps, also known as Progressive Web Apps (PWAs), using JavaScript and Node.js. The author starts by cloning an existing PWA and adding a service worker script that enables offline functionality. To make the app installable, it adds a web app manifest and uses Workbox to generate a service worker script automatically. This process allows for faster updates of assets and reduces bandwidth usage. The article also covers how to add icons to the manifest file using an online tool and provides instructions on how to deploy the app to a hosting service.