All of the commands except eject will still work, but they will point to the copied scripts so you can tweak them. Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. This command will remove the single build dependency from your project. If you aren't satisfied with the build tool and configuration choices, you can eject at any time. See the section about deployment for more information. The build is minified and the filenames include the hashes. It correctly bundles React in production mode and optimizes the build for the best performance. npm run buildīuilds the app for production to the build folder. See the section about running tests for more information. Launches the test runner in the interactive watch mode. You may also see any lint errors in the console. The page will reload when you make changes. In the project directory, you can run: npm start This project was bootstrapped with Create React App.