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AI Chatbot with Persistent Chats

Full-stack AI chatbot application with persistent conversation history, modern chat interface, and production-ready deployment on AWS EC2.

ReactNode.jsExpressJSMongoDBAmazon EC2
The Problem

What needed solving

Building a functional AI chatbot is straightforward — but building one that feels natural, retains context across sessions, and is production-ready is a different challenge. The goal was to ship a full-stack AI chat application with persistent conversation history, a clean modern UI, and a reliable backend deployment that could handle real usage.

The Solution

How I solved it

Built a full-stack AI chatbot with React on the frontend deployed on Vercel, and a Node.js + Express backend running on AWS EC2 with PM2 and Nginx. MongoDB stores all conversation history, allowing users to start new chats, revisit previous ones, and experience a seamless AI thinking indicator during response generation.

Screenshots

A look at the product

AI Chatbot with Persistent Chats screenshot 1
AI Chatbot with Persistent Chats screenshot 2
AI Chatbot with Persistent Chats screenshot 3
AI Chatbot with Persistent Chats screenshot 4
AI Chatbot with Persistent Chats screenshot 5
What I Built

Key Features

  • Persistent conversation history — start new chats or revisit previous ones
  • AI thinking indicator for clear response generation feedback
  • Modern chat interface with clean sidebar navigation
  • Full conversation switching without page reloads
  • MongoDB-backed storage for reliable chat persistence
  • Production deployment with PM2 process management and Nginx reverse proxy
Under the Hood

Architecture

  1. 01React frontend with component-based chat UI deployed on Vercel
  2. 02Node.js + Express REST API handling chat requests and conversation management
  3. 03MongoDB for persistent storage of conversation threads and message history
  4. 04OpenAI API integration for AI-generated responses with streaming support
  5. 05AWS EC2 backend deployment with PM2 for process management
  6. 06Nginx reverse proxy for SSL termination and request routing
Impact

Results & Outcomes

Full-stack production deployment across Vercel and AWS EC2

Persistent chat history with instant conversation switching

Sub-second UI response with AI thinking indicator for clear UX feedback

Scalable backend architecture ready for multi-user expansion

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