Developing a Chat Application in Ruby


A chat application is a real-time communication tool that allows users to exchange messages. Developing a chat application in Ruby is a rewarding project that can help you learn about networking, web development, and real-time data transfer. In this guide, we'll explore the basics of building a chat application using Ruby.


Before you start, make sure you have the following prerequisites:

  • Basic knowledge of the Ruby programming language
  • A code editor (e.g., Visual Studio Code, Sublime Text)
  • Familiarity with basic web development concepts (HTML, CSS)

Step 1: Set Up the Project

Create a new Ruby project folder and organize it into directories. You can structure your project with a Ruby script for the server and HTML/CSS for the frontend interface. Set up the server to handle WebSocket connections for real-time chat.

Step 2: Design the User Interface

Design the user interface for the chat application using HTML and CSS. Create an input field for sending messages and a display area for showing the conversation. You can use libraries like Bootstrap for styling or create a custom design.

Step 3: Create Ruby Logic

Write Ruby code to handle WebSocket connections, manage user messages, and broadcast messages to all connected users. You can use the popular WebSocket library 'faye-websocket' for Ruby. Here's a sample Ruby script for a basic chat server:

require 'faye/websocket'
require 'eventmachine' do
@channels = []
class ChatBackend
def initialize(app)
@app = app
def call(env)
if Faye::WebSocket.websocket?(env)
ws =, nil, { ping: 30 })
ws.on :open do |event|
@channels << ws
ws.on :message do |event|
@channels.each { |channel| channel.send( }
ws.on :close do |event|
EM::WebSocket.start(host: '', port: 8080, &

Step 4: Real-Time Chat

Add logic to handle real-time chat. Messages sent by one user should be immediately broadcast to all connected users. You can also implement features like user registration, private messages, and message history storage.


Developing a chat application in Ruby is an engaging project that can enhance your programming and web development skills. You can expand this application by adding features like user authentication, group chat rooms, and more advanced user interfaces.

Use this chat application for personal communication or as a learning tool to explore real-time web development with Ruby. Ruby is a versatile language for web applications and is well-suited for real-time communication systems like chat applications.

Enjoy building your chat application with Ruby!