The ability to parse query strings was taken out of React Router v4 because there have been user requests over the years to support different implementation. So the decision has been given to users to choose the implementation they like. The recommended approach is to use query strings library.
const queryString = require('query-string');
const parsed = queryString.parse(props.location.search);
You can also use
URLSearchParams if you want something native:
const params = new URLSearchParams(props.location.search)
const foo = params.get('name')
You should use a polyfill for IE11.