Describe a project you built using MERN stack.

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🔹 Project Title: Task Manager (MERN-based To-Do App)

Overview

A Task Manager Web Application that allows users to create, update, delete, and track their daily tasks. The app supports authentication, real-time updates, and stores data in a MongoDB database.

Technologies Used (MERN)

• MongoDB → NoSQL database for storing users and tasks.

• Express.js → Backend framework for handling routes and APIs.

• React.js → Frontend for building a dynamic user interface.

• Node.js → Runtime environment to run the server.

Key Features

1. User Authentication

   • Signup & Login with JWT (JSON Web Token).

   • Passwords hashed using bcrypt for security.

2. Task Management

   • Create, Read, Update, Delete (CRUD) tasks.

   • Mark tasks as completed or pending.

3. User Dashboard

   • Displays tasks specific to the logged-in user.

   • Filters: All tasks, Completed tasks, Pending tasks.

4. Real-Time Updates (Optional)

   • Used Socket.io for live task updates across multiple sessions.

Architecture & Flow

1. Frontend (React)

   • UI built with React functional components + hooks (useState, useEffect).

   • Axios used for API requests.

   • React Router for navigation (Login, Register, Dashboard).

2. Backend (Express + Node)

   • RESTful APIs for user authentication and task operations.

   • Middleware for JWT authentication.

   Example route:

   app.post("/api/tasks", authenticateUser, async (req, res) => {
     const task = new Task({ ...req.body, userId: req.user.id });
     await task.save();
     res.json(task);
   });
   

3. Database (MongoDB)

   • users collection → stores user info.

   • tasks collection → stores task details linked by userId.

Sample Workflow

• A user registers and logs in → JWT token generated.

• On login, frontend stores the token in localStorage.

• User adds a new task → React sends request to Express API with token.

• API verifies token, saves task in MongoDB, and returns updated list.

• React updates UI dynamically without full page reload.

Outcome & Learnings

• Learned state management in React for handling complex UI.

• Gained experience in REST API design and JWT authentication.

• Understood how to structure a full-stack MERN project for scalability.

✅ In summary:
This MERN stack project allowed me to build a real-world full-stack application combining frontend, backend, and database. It gave hands-on experience in user authentication, CRUD operations, and connecting React with Node/Express APIs.

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