React Developer Tools - Chrome Extension https://chrome.google.com/webstore/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi?hl=en
Use it to inspect these React sites:
Building robust web apps with React: Part 3, testing with Jasmine http://maketea.co.uk/2014/05/22/building-robust-web-apps-with-react-part-3.html
Lint Like It's 2015 https://medium.com/@dan_abramov/lint-like-it-s-2015-6987d44c5b48