Your nodejs version should be v7 or newer.

To start the web server you have to provide environment variable for you app key:

export WEATHER_APP_KEY=you_app_key

After you have the environment variable. You can start the web server with:

npm install
node index.js

Open http://localhost:8181 in your browser

GET: /                           - will render the home page
GET: /get-city/{CITY_ID}         - will return the reduced data for 5 days
GET: /get-city-details/{CITY_ID} - will return full non-reduced data

This class will execute requests to get a city's weather data from https://openweathermap.org/forecast5

And since OpenWeatherMap allows one request per 10 minutes (or your APPKEY will be blocked for a while) the result from the first request will be kept into a file in your temp folder.

The cache file will expire on every 12 minutes (stay on the safe side regarding the 10 minutes. I don't want to take the risk :))

let WeatherAPI = require('./lib/weather-api')
let weatherApi = new WeatherAPI(APPKEY)

Will throw error if the APPKEY is missing.

weatherApi.get(cityId)

The OpenWeatherMap JSON response contains list property. Pass it to the function and it will combine all results by date keeping only the minimal and maximal temperature for the day.

weatherApi.reduce(response.list)

Run:

npm test

No HTTP requests and no files were harmed during the unit tests execution (They are fully isolated by stubing the curlrequest and fs methods)