sadhika29/ExpenceTracker_MERN ? reverse-engineered prompt

Build me a full stack expense tracker app where people can sign up, log in, pick a profile avatar, and keep track of their income and expenses in one place.

I want users to be able to add, edit, and delete transactions, then filter them by date range and by type like income or expense. The app should also show a dashboard with totals, category breakdowns, and simple analytics so it is easy to understand where the money is going. Make it feel clean and modern, and make sure it works well on mobile too.

Use a React frontend with a Node and Express backend and MongoDB for storage. Add basic security like hashed passwords, secure headers, and proper CORS setup. Use toast messages for feedback and keep the whole thing ready to deploy, with the frontend on Vercel, the backend on Render, and the database on MongoDB Atlas. If you need current docs, look them up online.