BMI calculator

This is a sample application to calculate the BMI and determine the BMI category and health risk of the patients.

Input data

The data which the application takes in is a json file in the directory /domain/services. For the time being, I have put dummy data inside the directory. The reason for considering the data input as a file rather than a JSON object that can be passed into the request body is because the problem statement states that the input range may go upto 1 Lakh.

Sample input data

dummy_data.json

[
    { "Gender": "Male", "HeightCm": 171, "WeightKg": 96 },
    { "Gender": "Male", "HeightCm": 161, "WeightKg": 85 },
    { "Gender": "Male", "HeightCm": 180, "WeightKg": 77 },
    { "Gender": "Female", "HeightCm": 166, "WeightKg": 62 },
    { "Gender": "Female", "HeightCm": 150, "WeightKg": 70 },
    { "Gender": "Female", "HeightCm": 167, "WeightKg": 50 }
]

Endpoints

/calculate

This endpoint looks for the filename dummy_data.json inside the directory domain/services and performs the necessary operations.

Sample response data

{
    "success": true,
    "data": {
        "individual_reports": [
            {
                "gender": "Male",
                "bmi": 32.83061454806607,
                "bmi_category": "Moderately obese",
                "health_risk": "Medium risk"
            },
            {
                "gender": "Male",
                "bmi": 32.79194475521777,
                "bmi_category": "Moderately obese",
                "health_risk": "Medium risk"
            },
            {
                "gender": "Male",
                "bmi": 23.76543209876543,
                "bmi_category": "Normal weight",
                "health_risk": "Low risk"
            },
            {
                "gender": "Female",
                "bmi": 22.49963710262738,
                "bmi_category": "Normal weight",
                "health_risk": "Low risk"
            },
            {
                "gender": "Female",
                "bmi": 31.11111111111111,
                "bmi_category": "Moderately obese",
                "health_risk": "Medium risk"
            },
            {
                "gender": "Female",
                "bmi": 17.92821542543655,
                "bmi_category": "Underweight",
                "health_risk": "Malnutrition risk"
            }
        ],
        "overweight_patients_count": 6
    }
}

Env variables

Add a file called .env in the root directory with the following content.

Note: the content inside the angluar brackets <> have to be replaced with custom values.

PORT=<custom PORT>
API_VERSION=<custom versioning>
NODE_ENV=<production or development>

Tests

There are two unit tests which are written using Mocha. Mocha is a testing framework for NodeJS which allows developers to easily test their code.