Full-Stack AI Chatbot with OpenRouter Integration | MERN + NestJS + Redux

This is a full-stack AI chatbot application designed and developed from scratch. The platform simulates real-time conversations between users and an intelligent assistant, powered by modern AI models through OpenRouter. I handled both frontend and backend development, UI/UX design, deployment, and integration with external AI services. Key Features: Built with NestJS + MongoDB on the backend React.js + Redux Toolkit for frontend with real-time updates Authentication using JWT Full CRUD operations for chats and messages Supports user and assistant message types Responsive design for all screen sizes (Mobile / Tablet / Desktop) API documentation created using Swagger Deployed on Railway with live demo and GitHub code available