How to Create a Mobile App with Node.js (NodeJS for Mobile Apps) | RapidAPIIt does not take an expert to determine that the computing power of a server is most likely greater than the computing power of a mobile device. The commands create a new NPM project and download some of the packages that we are going to use. In the terminal, checking to make sure that you are in the express-server folder, run npm run dev. This function is also going to be run when the app loads, and we are going to use the React useEffect hook to accomplish that.