Phoenix APIs, Channels, and Presence (Elixir/BEAM)

Phoenix excels at REST/JSON APIs and WebSocket Channels with minimal boilerplate, leveraging the BEAM for fault tolerance, lightweight processes, and supervised PubSub/Presence.

Core pillars

• Controllers for JSON APIs with plugs, pipelines, and versioning.
• Contexts own data (Ecto schemas + queries) and expose a narrow API to controllers/channels.
• Channels + PubSub for fan-out real-time updates; Presence for tracking users/devices.
• Auth via plugs (session/cookie for browser, token/Bearer for APIs), with signed params.

Project Setup