Quizify is a quiz web app with category-based quizzes, user registration and login, custom test creation, a leaderboard, and MongoDB-backed data.

• Home (Main.html): Browse categories (History, Science, Sports, and more), open the quiz flow, design a custom quiz, or pick existing user-created tests.
• Quiz session (index.html): Choose number of questions, difficulty, and question type; questions are loaded from the API.
• Auth (register.html, login.html): Register and log in with email and password (JWT returned on success).
• Create test (create-test.html): Build a named quiz with category, difficulty, and embedded questions.
• Existing tests (select-test.html): List saved tests and load questions for a selected test.
• Leaderboard: Scores are submitted after a quiz and ranked on the leaderboard API.

• Backend: Node.js, Express, Mongoose
• Database: MongoDB (local), database name quizzify
• Frontend: Static HTML, CSS, and inline/fetch-based JavaScript

• Node.js (LTS recommended)
• MongoDB running locally (default mongodb://localhost:27017)

1. Clone or copy this project and open the project folder in a terminal.

2. Install dependencies:

   npm install

3. Start MongoDB so it accepts connections on localhost:27017.

The project uses several Express servers on different ports. Start each in its own terminal from the project root:

Example:

node quiz.js

node leaderboardServer.js

node server.js

node server-selecting-test.js

Open Main.html in the browser. Because the pages call http://localhost:..., use a local static server if plain file:// causes issues (for example, the “Live Server” extension in VS Code, or npx serve .).

• Port 3000 (quiz.js): GET /get-questions?num=&level=&type=&category=
• Port 4000 (leaderboardServer.js): GET|POST /api/leaderboard
• Port 5000 (server.js): POST /api/register, POST /api/login, GET /api/questions, POST /api/create-test
• Port 5005 (server-selecting-test.js): GET /quizzify/tests, GET /api/test-questions/:testId

Models live under models/ (for example User, Question, Test, Leaderboard). Seed the questions collection in MongoDB so category quizzes return data.

server.js uses a hard-coded JWT secret for development. For any real deployment, move secrets to environment variables and use a strong random value.

This project is for educational / portfolio use unless you add your own license.