How do you test a django webapplication's front end when it's heavy JS?

This is more of a guidance thing. Here's the general breakdown of my app:

• It has a backend with all the models
• It has an app for the API routing and the serializers/viewsets
• It has a frontend that takes care of the main routing (index, contact us, content, etc.) and serves the templates and the static components
• Part of the static components are mustache-js templates. When the user loads the page the client performs some ajax requests to the API and pulls in data, it then takes care of populating components.

I currently have tests for

• Backend models
• API behavior and methods
• Frontend paths actually loading

But how do I test the parts where it's mostly JS dependent? I've been using selenium to do this. Is this the right approach? It does seem awfully hacky.