all tasks are done inside server.js

task 1

Express.js Setup in your terminal,

1. Step 1: Initialize Node.js project npm init -y
2. Step 2: Install Express.js and required dependencies npm install express body-parser uuid
3. Create a basic Express server
4. Step 4: Run the server node server.js or npm install

If everything’s correct, you’ll see: Server is running on http://localhost:3000

5. Then open your browser and visit: http://localhost:3000

task 2 since my laptop is lagging and super slow am using the terminal to test my APIs

1. Get all products Invoke-RestMethod -Uri "http://localhost:3000/api/products" -Method GET -Headers @{ "x-api-key" = "mysecretkey" }

2. get product by id Invoke-RestMethod -Uri "http://localhost:3000/api/products/1" -Method GET -Headers @{ "x-api-key" = "mysecretkey" }

3. cretae a product Invoke-RestMethod -Uri "http://localhost:3000/api/products" -Method POST -Headers @{ "x-api-key" = "mysecretkey"; "Content-Type" = "application/json" } ` -Body '{"name":"Tablet","description":"Android tablet with 10-inch display","price":400,"category":"electronics","inStock":true}'

4. update existing product Invoke-RestMethod -Uri "http://localhost:3000/api/products/1" -Method PUT -Headers @{ "x-api-key" = "mysecretkey"; "Content-Type" = "application/json" } ` -Body '{"price":1300,"inStock":false}'

5. delete existing product Invoke-RestMethod -Uri "http://localhost:3000/api/products/3" -Method DELETE -Headers @{ "x-api-key" = "mysecretkey" }

task 3

1. Invoke-RestMethod -Uri http://localhost:3000/api/products -Method GET -Headers @{ "x-api-key" = "mysecretkey" } you should see [2025-10-19T22:30:00.000Z] GET /api/products

2. correct api key should work Invoke-RestMethod -Uri http://localhost:3000/api/products -Method GET -Headers @{ "x-api-key" = "mysecretkey" }

wrong /missing api fail Invoke-RestMethod -Uri http://localhost:3000/api/products -Method GET

3. test valdation missing field fail Invoke-RestMethod -Uri http://localhost:3000/api/products -Method POST -Headers @{ "x-api-key" = "mysecretkey"; "Content-Type" = "application/json" } -Body '{ "name": "Tablet" }'

coorect pass Invoke-RestMethod -Uri http://localhost:3000/api/products -Method POST -Headers @{ "x-api-key" = "mysecretkey"; "Content-Type" = "application/json" } -Body '{ "name": "Tablet", "description": "Android tablet", "price": 400, "category": "electronics" }'

task 4

1. ❌ 2. Test NotFoundError

Try fetching a product that doesn’t exist:

Invoke-RestMethod -Uri "http://localhost:3000/api/products/9" -Method GET -Headers @{ "x-api-key" = "mysecretkey" }

expected response { "error": true, "message": "Product not found" }

2. ⚠️ 3. Test ValidationError

Try creating a product without all required fields:

Invoke-RestMethod -Uri http://localhost:3000/api/products -Method POST -Headers @{ "x-api-key" = "mysecretkey"; "Content-Type" = "application/json" } ` -Body '{"name": "TV"}'

✅ Expected Response: { "error": true, "message": "Please provide all required fields: name, description, price, category" }

3.🔒 4. Test UnauthorizedError

Try accessing the API without the API key: Invoke-RestMethod -Uri http://localhost:3000/api/products -Method GET

✅ Expected Response: { "error": true, "message": "Unauthorized: Invalid API key" }

💥 5. Test Global Error Handling

To test the global middleware, you can simulate a server error (for example, by manually throwing one inside a route):

app.get('/api/test-error', (req, res) => { throw new Error('Something went wrong!'); });

the visit: http://localhost:3000/api/test-error

expected outcome : { "error": true, "message": "Something went wrong!" }

task 5

1. Get all products (paginated) Invoke-RestMethod -Uri "http://localhost:3000/api/products" ` -Method GET -Headers @{ "x-api-key" = "mysecretkey" }

2. Filter by category Invoke-RestMethod -Uri "http://localhost:3000/api/products?category=electronics" ` -Method GET -Headers @{ "x-api-key" = "mysecretkey" }

3. Search by name Invoke-RestMethod -Uri "http://localhost:3000/api/products/search?name=Phone" ` -Method GET -Headers @{ "x-api-key" = "mysecretkey" }

4. View stats Invoke-RestMethod -Uri "http://localhost:3000/api/products/stats" ` -Method GET -Headers @{ "x-api-key" = "mysecretkey" }