Phoenix LiveView Has a Free API: Build Real-Time Web Apps Without JavaScript

React needs 200KB of JavaScript for real-time features. Phoenix LiveView needs zero — it sends HTML diffs over WebSockets. What Is Phoenix LiveView? Phoenix LiveView lets you build rich, real-time UIs in Elixir without writing JavaScript. State lives on the server. When it changes, LiveView calculates the HTML diff and sends only the changed bytes over WebSocket. defmodule MyAppWeb . CounterLive do use MyAppWeb , :live_view def mount ( _params , _session , socket ) do { :ok , assign ( socket , count: 0 )} end def handle_event ( "increment" , _params , socket ) do { :noreply , update ( socket , :count , & ( &1 + 1 ))} end def render ( assigns ) do ~H"" " <h1>Count: <%= @count %></h1> <button phx-click=" increment ">+1</button> """ end end Click the button → event sent to server over WebSocket → server updates state → server sends HTML diff → DOM patches. User sees instant update. Zero JavaScript written. Real-Time Features in Minutes # Live search with debounce def handle_event ( "searc