📝 Online Exam System (Backend)

A full-featured backend for an online exam system built with Node.js, Express, and MongoDB. It supports user authentication, exam creation and participation, real-time notifications via Socket.IO, role-based access control, and more.

🚀 Features

👥 Authentication

• User registration & login
• Roles: admin, student
• Department assignment (e.g., mearn, dotnet, python)

🧪 Exams Module

• Admins/teachers can:
  • Create, update, delete exams
  • Set department, schedule, and duration
  • Notify students of new exams in their department
• Students can:
  • View available exams for their department

❓ Questions Module

• Admins can:
  • Create, update, delete questions linked to exams
• Students:
  • Retrieve exam questions (without correct answers)

✅ Submissions

• Students can:
  • Start and submit exams
  • Submit answers, get auto-scored with percentage
• Admins can:
  • View all submissions per exam
• Students:
  • View personal submission history

🔔 Notifications

• Sent to:
  • All students in a department when a new exam is created
  • The exam creator when a student submits
• Real-time support using Socket.IO

📦 Validation Layer

• Express-validator used for:
  • Signup/Login
  • Exam creation/update
  • More coming soon...

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⚙️ Tech Stack

• Node.js
• Express
• MongoDB + Mongoose
• Socket.IO (Real-time notifications)
• JWT for Auth
• Express-validator
• RESTful API structure

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📦 Getting Started

1. Clone the Repo

git clone https://github.com/your-username/online-exam-system-backend.git
cd online-exam-system-backend

npm install

### 3. Set Environment Variables

Create a `config.env` file in the root directory and add your environment variables:

```env
PORT=4000
MONGO_URI=your_mongodb_connection_string
JWT_SECRET=your_jwt_secret
JWT_EXPIRE=30d