Navigate to the server directory.

1. Install Dependencies:

   cd server
   npm install

2. Environment Configuration: Create a .env file in the server root and add your credentials:

   PORT=4000
   MONGODB_URL="your_mongodb_connection_string"
   JWT_SECRET="your_super_secret_key"
   NODE_ENV="development"
   
   # Email Service (e.g., Brevo/SMTP)
   SMTP_USER="your_smtp_user"
   SMTP_PASSWORD="your_smtp_password"
   SENDER_EMAIL="your_sender_email@example.com"

3. Start Server:

   npm run server
   # Server runs on http://localhost:4000

Navigate to the client directory.

1. Install Dependencies:

   cd client
   npm install

2. Environment Configuration: Create a .env file in the client root:

   VITE_BACKEND_URL=http://localhost:4000

3. Start Application:

   npm run dev
   # App runs on http://localhost:5173

// merge test

node server.js

---

## Questions API (No Auth Needed)

### Test 1: Get All Careers

GET http://localhost:5050/api/questions/careers

**Expected:** List of 3 careers (MLEngineer, DataScientist, SoftwareEngineer)

---

### Test 2: Get ML Engineer Easy Questions

GET http://localhost:5050/api/questions?career=MLEngineer&difficulty=Easy

**Expected:** 20 Easy questions from MLEngineerQ collection

---

### Test 3: Get Data Scientist Medium Questions

GET http://localhost:5050/api/questions?career=DataScientist&difficulty=Medium

**Expected:** 20 Medium questions from DataScientistQ collection

---

### Test 4: Get Software Engineer Hard Questions

GET http://localhost:5050/api/questions?career=SoftwareEngineer&difficulty=Hard

**Expected:** 20 Hard questions from SoftwareEngineerQ collection

---

### Test 5: Get Questions by Category

GET http://localhost:5050/api/questions?career=SoftwareEngineer&difficulty=Hard&category=Security

**Expected:** Only Security category questions

---

### Test 6: Get Single Question

GET http://localhost:5050/api/questions/69b1eb1f858eabad2fed4967?career=SoftwareEngineer

(Use an actual `_id` from your Test 4 response)

---

### Test 7: Submit Answer

POST http://localhost:5050/api/questions/submit Content-Type: application/json

Body (raw JSON): { "career": "SoftwareEngineer", "questionId": "69b1eb1f858eabad2fed4967", "answer": "A tree-like structure of a web page" }

**Expected:** `{ "success": true, "correct": true }`

---

### Test 8: Submit Wrong Answer

POST http://localhost:5050/api/questions/submit Content-Type: application/json

Body: { "career": "SoftwareEngineer", "questionId": "69b1eb1f858eabad2fed4967", "answer": "wrong answer" }

**Expected:** `{ "success": true, "correct": false, "correctAnswer": "..." }`

---

## Progress API (Auth Required)

### Test 9: Login First

POST http://localhost:5050/api/auth/login Content-Type: application/json

Body: { "email": "your@email.com", "password": "yourpassword" }

**Copy the token from response!**

---

### Test 10: Get Progress (with token)

GET http://localhost:5050/api/progress?career=MLEngineer

Authorization: Bearer <your_token>

In Postman: **Authorization tab → Bearer Token → Paste token**

---

### Test 11: Update Progress

POST http://localhost:5050/api/progress/update Authorization: Bearer <your_token> Content-Type: application/json

Body: { "career": "MLEngineer", "difficulty": "Easy", "correct": true }

---

### Test 12: Get All Progress

GET http://localhost:5050/api/progress/all Authorization: Bearer <your_token>

---

### Test 13: Reset Progress

POST http://localhost:5050/api/progress/reset Authorization: Bearer <your_token> Content-Type: application/json

Body: { "career": "MLEngineer" }