Temperature Converter API Challenge

Your Task

Build an Express.js API that converts Celsius to Fahrenheit.

Requirements

Endpoint

• Route: GET /convert
• Query Parameter: celsius (number)
• Returns: JSON with both temperatures

Example Request

GET /convert?celsius=25

Example Response

{
  "celsius": 25,
  "fahrenheit": 77
}

Error Handling

Return proper error for:

• Missing celsius parameter
• Invalid input (not a number)

Error Response Example

{
  "error": "Invalid input: celsius must be a number"
}

Getting Started

1. Open server.js
2. Find the TODO sections
3. Implement the conversion logic
4. Test your API

Running Your Server

node server.js

Server runs on port 3000.

Testing

# Test valid request
curl "http://localhost:3000/convert?celsius=0"

# Test invalid request
curl "http://localhost:3000/convert?celsius=abc"

# Or run automated tests
node test.js

Formula

Fahrenheit = (Celsius × 9/5) + 32

Tips

• Check if celsius query parameter exists
• Validate it's a number using isNaN()
• Use parseFloat() to convert string to number
• Round to 2 decimal places

Good luck! 🚀