Module not found: Can't resolve 'react-router-dom' in '/home/oci-lp-3/workspace/my-app/src/components' code example

Example 1: Module not found: Can't resolve 'react-router-dom'

npm install react-router-dom --save

Example 2: Module not found: Can't resolve 'react-router-dom'

npm i react-router-dom --save