[chrismccord]

We structure Elixir applications differently than a lot of platforms. Phoenix is not your app – it's just one thing that slots into your Elixir application's supervision tree. So you can run one Phoenix web server or multiple in a single Erlang VM, and nothing changes. Your Phoenix endpoint isn't global, so it will happily sit alongside several, or it will happily serve a single web server to any number of Phoenix routers serving different APIs.

So to answer your question directly, you could either add your JSON or GraphQL API directly in the same router that serves your LiveViews, or you could create a router specific to the API, or you could introduce a completely separate Phoenix endpoint and router that starts a 2nd web server. Both would boot as part of the app serving different ports. Phoenix remains a great choice for native clients if we're talking JSON/GraphQL, but because we also have native channels clients in objc/swift. Hope that helps!