# Phoenix Framework — Productive Web Framework for Elixir

> Phoenix is a web framework for Elixir that provides peace of mind from prototype to production. Channels for real-time communication, LiveView for server-rendered reactive UI, and the fault-tolerance of the BEAM VM. Built for apps that need to scale.

## Install

Save the content below to `.claude/skills/` or append to your `CLAUDE.md`:

## Quick Use

```bash
mix archive.install hex phx_new
mix phx.new my_app --database postgres
cd my_app
mix setup
mix phx.server
# Visit http://localhost:4000
```

```elixir
# lib/my_app_web/router.ex
scope "/api", MyAppWeb do
  pipe_through :api
  resources "/assets", AssetController, only: [:index, :create]
end

# lib/my_app_web/controllers/asset_controller.ex
defmodule MyAppWeb.AssetController do
  use MyAppWeb, :controller

  def index(conn, _params) do
    assets = Repo.all(Asset)
    json(conn, %{assets: assets})
  end
end
```

## Intro

Phoenix is the premier web framework for Elixir, created by Chris McCord. It provides peace of mind from prototype to production: Channels for real-time communication, LiveView for server-rendered reactive UIs (no JavaScript needed), and the fault-tolerance of the BEAM virtual machine. Phoenix consistently handles millions of concurrent WebSocket connections per server.

- **Repo**: https://github.com/phoenixframework/phoenix
- **Stars**: 22K+
- **Language**: Elixir
- **License**: MIT

## What Phoenix Does

- **MVC** — controllers, views, templates
- **Channels** — real-time WebSocket communication
- **LiveView** — server-rendered reactive UI (no JS framework needed)
- **Ecto** — database query DSL and migrations
- **PubSub** — distributed pub/sub
- **Presence** — track connected users
- **Telemetry** — instrumentation hooks
- **mix phx.gen** — generators for context, schema, HTML, JSON

## Comparison

| Framework | Concurrency | Real-time |
|---|---|---|
| Phoenix | BEAM processes | Channels + LiveView |
| Rails | Threads | ActionCable |
| Django | WSGI + Channels | Django Channels |
| Next.js | Node.js | WebSocket via lib |

## FAQ

**Q: Can LiveView replace React?**
A: For medium-to-high interactivity apps, yes. LiveView pushes HTML diffs over WebSocket to the browser with sub-50ms latency — the feel is great. For very complex front-end interactions, React/Vue + Phoenix API is still recommended.

## Sources

- Docs: https://hexdocs.pm/phoenix
- GitHub: https://github.com/phoenixframework/phoenix
- License: MIT

---
Source: https://tokrepo.com/en/workflows/phoenix-framework-productive-web-framework-elixir-412ffb02
Author: Script Depot