Chat App

A real-time chat application built with Node.js, TypeScript, PostgreSQL and WebSockets.

Tech Stack

• Node.js + Express + TypeScript
• PostgreSQL
• JWT Authentication
• WebSockets (ws library)
• Docker + Docker Compose

Running locally

• git clone git@github.com:jaysreeb/chat_app.git
• cd chat_app
• docker compose up --build

Creating the websocket Server in websocket/server.ts

• 1. Extract token from query string
• 2. Verify the Token
• 3. Register the Connection
• 4. Tell the user they're connected
• 5. Handle Incoming messages
• 6. Handle disconnect
• 7. If recipient is online, deliver immediately
• 8. Confirm delivery to sender
• 9. Recipient offline — tell sender
• 10. Next step: persist to PostgreSQL