If you need to make a server for your app, you have to use Node.js. The first thing you need to do is install node and npm. Then, go into your Node command prompt. Then you have to change your directory. It sometimes helps to move your app into a different directory. Using the command cd you have to go into your App folder. To go up a directory, use cd..
Then, when you are in your App folder, write npm install http and press enter. Then write http-server and hit enter. Wait for it to finish and you have your server! This is all you need to know to create a web app.