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Luke Chat App

The Chat App is a real-time messaging web application that allows users to chat, react to messages, and see online users in real time. Built with JavaScript, Node.js, WebSockets, and REST APIs, it provides a responsive, interactive experience.

Key Features

  • Real-time messaging using WebSockets, with polling fallback for reliability
  • User registration and session persistence via local storage
  • Like and dislike reactions on messages
  • System notifications for user join/leave events
  • Online user count displayed dynamically
  • Mobile-friendly interface

Key Technologies

Category Technology Description
Frontend JavaScript, HTML, CSS Dynamic UI rendering and user interaction.
Backend (API) Node.js, Express.js RESTful endpoints for messaging, reactions, and user management.
Real-time WebSockets (Socket) Real-time message delivery with fallback polling.
Data Storage JSON/Backend API Message persistence and online user tracking.
Validation Local checks Ensures message content and username integrity.

Prerequisites

  • Node.js 20.x LTS
  • A running backend (deployed or local)

Configuration

The frontend connects to the backend using:

const BACKEND_URL = "https://luke-chat-app-backend.hosting.codeyourfuture.io";
const API_BASE = `${BACKEND_URL}/api`;
const WS_URL = `${BACKEND_URL.replace("https://", "wss://").replace("http://", "ws://")}/ws`;