NodeJS and NPM version NodeJS version: 20.11.1 NPM version: 10.4.0 Usage In the project directory, you can run: npm install Then install json-server: npm install -g json-server To start project type: npm start And run Json Server: npx json-server --watch --port 3001 db.json If you want to use Json Server -> Go to src/sagas/CustomerSags.js in line 10 and remove .content Backend Spring Boot https://github.com/MinhHieu012/Simple-CRUD-SpringBoot