You can run the app with a PHP Built_in server (all npm command relys on it), but some features may not work finely. In fact, Api-platform package rely on some HTTP SERVER features that are not implemented by the PHP Built-in server. So the api indexes like /api/index.json, /api/index.jsonld or /api/index.html will just return a 404 Not Found. There is also the react-admin app generated by the Api-platform that will not work because it relies on api json index. But, Vuejs, ReactJS and Angular together ? with Symfony4, WTF ??? Yes it can seems completely stupid to use all this technologies together, but don't forget one thing : this is a POC ! The aim is not to help you to mix all those techs, but just to help you to use some of them finely. The biggest problem in my case is the dependancy management : all those JS libraries may need the same deps but in different version... For instance it seems to be ok, but i think that in future it could be a real brain-teaser.