A real-time chat server using WebSockets, built with TypeScript and the ws library on Node.js. The server supports named users, broadcasts messages to all connected clients, tracks join/leave events, and includes a browser-based test client. Prerequisites Node.js 20 or later npm 9 or later A Unix-like terminal (macOS, Linux, or WSL on Windows) A modern web browser for the test client Step 1: Set up the project structure Create the file mkdir -p websocket-chat-server touch websocket-chat-server/.gitignore Add the code: websocket-chat-server/.gitignore node_modules/ dist/ *.js *.d.ts *.js.map !jest.config.js .DS_Store *.log tmp/ Detailed breakdown node_modules/ excludes installed dependencies, which are restored with npm install. dist/ excludes compiled TypeScript output. *.js, *.d.ts, *.js.map exclude generated JavaScript files in the source tree. The !jest.config.js exception keeps the test config if it were in JS format. .DS_Store, *.log, and tmp/ cover common OS and temporary artifacts. Step 2: Initialize the project and install dependencies Create the file cd websocket-chat-server npm init -y Install runtime and development dependencies: ...