An Ionic React Front end implementation of capacitor barcode scanner on a nestjs back end $ npm install $ cd nest-barcode $ npm install Run the nest server first ~/ionic-barcode/nest-server/ $ npm start Run the Ionic Server ~/ionic-barcode/: $ yarn start Change the nest url to your local dev url ~/ionic-barcode/src/pages/Tab1.tsx // Edit this line const url = 'https://localhost:3000/'