Web-based application data manipulation

I am writing web-based application where I downloading data from server and implementing them into the 3D environtment accordingly to user's configuration. So there are potentionally two kinds of data I want to work with.

I'm new in the web-development, therefor I don't know what tools or implementation is appropriate to use. I desire to create serverless app running in client's web-browser.

So far I implemented php proxy which I'm using for downloading and saving realtime data from remote server into a file (replacing them with new ones) and bypassing CORS. Is it an OK solution in my situation? And what about user's configuration?