NPM Start for Offline app Change package.json file as follows Run App npm start For angular "scripts": { "ng": "ng", "start": "node node_modules/.bin/ng serve", "build": "node node_modules/.bin/ng build", "test": "node node_modules/.bin/ng test", "lint": "node node_modules/.bin/ng lint", "e2e": "node node_modules/.bin/ng e2e" } For React "scripts": { "start": "node node_modules/.bin/react-scripts start", "build": "node node_modules/.bin/react-scripts build", "test": "node node_modules/.bin/react-scripts test", "eject": "node node_modules/.bin/react-scripts eject" } For Vue "scripts": { "start": "node node_modules/.bin/vue-cli-service serve", "build": "node node_modules/.bin/vue-cli-service build", "lint": "node node_modules/.bin/vue-cli-service lint" }