This repository is having complete implementation of qr scanning, just clone it and then 'npm start' you are good to go. Cheers There is no need to do any thing extra, every thing is all ok setup is all completed. just download or clone then into your terminal and run the command, "npm install" then connect your device with PC or start your emulator then again run the command "react-native run-android" or "react-native run-ios" Cheers!!! https://aboutreact.com/react-native-scan-qr-code/