MERN Stack Quiz App

I'll create a quiz application using the MERN stack (MongoDB, Express, React, Node.js). This will include both the frontend React components and the backend API.

Backend Implementation Details

For a complete MERN stack quiz application, you would need to set up MongoDB, Express, and Node.js for the backend. Here's how you would implement the backend in a real-world scenario:

MongoDB Setup

1. Create a MongoDB Atlas account or set up a local MongoDB server

2. Create a database named "quizapp" with collections for:

   • quizzes
   • users
   • results

Express.js Server

Quiz Model

Quiz Routes

Connecting Frontend to Backend

To connect your React frontend to the Express backend:

1. Use environment variables to store your API URL
2. Create API service files to handle requests
3. Use React Query or SWR for data fetching and caching

Deployment

For deployment, you can:

1. Deploy the Next.js frontend to Vercel

2. Deploy the Express backend to services like:

   • Render
   • Railway
   • Heroku
3. Use MongoDB Atlas for your database

This implementation gives you a complete MERN stack quiz application with user authentication, quiz creation, and quiz-taking functionality.

Please make sure to add the following environment variable to your project:

Great! Now that you've added the MongoDB URI to your environment variables, let's update the application to properly connect to MongoDB and implement the database functionality for your quiz app.

MongoDB Integration Complete

Great! I've updated your MERN quiz app to properly connect to MongoDB using the environment variable you've added. Here's what I've implemented:

1. MongoDB Connection: Created a proper connection utility that handles both development and production environments.
2. Database Service Layer: Added a service layer to handle all database operations for quizzes, users, and quiz results.

3. API Routes: Updated all API routes to use the MongoDB connection:

   • /api/quizzes - For listing and creating quizzes
   • /api/quizzes/[id] - For getting, updating, and deleting specific quizzes
   • /api/auth/register and /api/auth/login - For user authentication
   • /api/results - For saving and retrieving quiz results
4. Frontend Integration: Updated the frontend components to fetch data from the API routes and handle loading/error states.

How to Test Your MongoDB Integration

1. Create a Quiz: Navigate to /create-quiz and create a new quiz. This will save the quiz to your MongoDB database.
2. Browse Quizzes: Go to /quizzes to see all quizzes stored in your database.
3. Take a Quiz: Click on any quiz to take it. Your results will be saved to the database.

Next Steps

To further enhance your MERN quiz app, you could:

1. Add User Authentication: Implement proper user authentication with JWT tokens and protected routes.
2. Add User Dashboard: Create a dashboard where users can see their quiz history and statistics.
3. Add Quiz Categories: Implement a proper category system with filtering.
4. Add Quiz Editing: Allow quiz creators to edit their quizzes after creation.
5. Add Timer Functionality: Implement a timer for quizzes to add time pressure.

Your quiz app now has a solid foundation with MongoDB integration, making it a true MERN stack application!

Please make sure to add the following environment variable to your project: