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available scripts create react app skip to main content create react app is deprecated read more here create react app docs help github search k welcome getting started getting started folder structure available scripts supported browsers and features updating to new releases development styles and assets building your app testing back end integration deployment advanced usage support on this page available scripts in the project directory you can run npm start runs the app in the development mode open http localhost 3000 to view it in the browser the page will reload if you make edits you will also see any lint errors in the console npm test launches the test runner in the interactive watch mode see the section about running tests for more information npm run build builds the app for production to the build folder it correctly bundles react in production mode and optimizes the build for the best performance the build is minified and the filenames include the hashes if necessary classnames and function names can be enabled for profiling purposes see the production build section for more information your app is ready to be deployed see the section about deployment for more information about deploying your application to popular hosting providers npm run eject note this is a one way operation once you eject you can t go back if you aren t satisfied with the build tool and configuration choices you can eject at any time this command will remove the single build dependency from your project instead it will copy all the configuration files and the transitive dependencies webpack babel eslint etc into your project as dependencies in package json technically the distinction between dependencies and development dependencies is pretty arbitrary for front end apps that produce static bundles in addition it used to cause problems with some hosting platforms that didn t install development dependencies and thus weren t able to build the project on the server or test it right before deployment you are free to rearrange your dependencies in package json as you see fit all of the commands except eject will still work but they will point to the copied scripts so you can tweak them at this point you re on your own you don t have to ever use eject the curated feature set is suitable for small and middle deployments and you shouldn t feel obligated to use this feature however we understand that this tool wouldn t be useful if you couldn t customize it when you are ready for it edit this page last updated on 2 13 2020 by lewis llobera previous folder structure next supported browsers and features npm start npm test npm run build npm run eject docs get started learn react community stack overflow github discussions twitter contributor covenant social github copyright 2025 facebook inc