The aim of this research was to test the JavaScript library React and framework AngularJS against each other in regard of the response time of the validation and validation robustness. The experiments in this work were performed to support developers in their decision making regarding which library or framework to use. There are many other aspects to consider when choosing which library or framework to develop in other than the security and response time related aspects mentioned in this work, but this work can, amongst other information, give yet another viewpoint to the developers. The results showed that there is no difference amongst them security wise, but that it was somewhat faster to validate in a React application than in an AngularJS application.