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In this tutorial I will show you how to build a progressive web app using React.js and <a href="https://cosmicjs.com/" target="_blank">Cosmic JS</a>. Our PWA will respond with status 200 when you are offline. The app will attain the last state of data and display it to you when you are offline. We will start with the basics and complete the app in full details. After completion we will deploy it to the Cosmic JS App Server, so let’s get started.