dark-sky-api

dark-sky-api

A simple and robust wrapper library for Dark Sky API (previously known as Forecast.io).

Features:

• Simple to use.
• Promise based (es6-promises).
• Lightweight browser location checking (by default).
• Versatile - use it statically or instantiate it.
• Dates returned as moments.
• Excludes are used automatically to reduce latency and save cache space (see 'Request Parameters').

See Dark Sky developer docs: https://darksky.net/dev/docs.

Need something even smaller? Dark sky api uses dark-sky-skeleton.

Install it

 npm install dark-sky-api

Require it

import DarkSkyApi from 'dark-sky-api';

or server side

const DarkSkyApi = require('dark-sky-api');

Configure it statically (suggested)

Configuring dark-sky-api with an api key is supported but each request will expose said api key (for anyone to capture).

For this reason Dark Sky strongly suggests hiding your API key through use of a proxy [ref].

// one of the two is required
DarkSkyApi.apiKey = 'your-dark-sky-api-key';
DarkSkyApi.proxyUrl = '//base-url-to-proxy/service'; // or set to true if running server side

// optional configuration
DarkSkyApi.units = 'si'; // default 'us'
DarkSkyApi.language = 'de'; // default 'en'
DarkSkyApi.postProcessor = (item) => { // default null;
  item.day = item.dateTime.format('ddd');
  return item;
}

Use it

Today's weather:

DarkSkyApi.loadCurrent()
  .then(result => console.log(result));

Forecasted week of weather:

DarkSkyApi.loadForecast()
  .then(result => console.log(result));

Specific time request:

DarkSkyApi.loadTime('2000-04-06T12:20:05')
  .then(result => console.log(result));

What about geo location?

By default dark-sky-api will use Geolocation.getCurrentPosition to grab the current browser location automatically.

To manually set geolocation position pass along a position object:

const position = {
  latitude: 43.075284, 
  longitude: -89.384318
};
DarkSkyApi.loadCurrent(position)
  .then(result => console.log(result));

Retrieve the current location from the browser

let position;
DarkSkyApi.loadPosition()
  .then(pos => {
    position = pos;
  });

Response units

To get the units used in dark sky api responses per configured unit type (default is 'us') use GetResponseUnits after configuration. Keep in mind that the units would need to be retrieved again if you changed the api units.

const responseUnits = DarkSkyApi.getResponseUnits();
DarkSkyAPi.loadCurrent()
  .then((data) => {
    console.log(`The temperature is ${data.temperature} degrees ${responseUnits.temperature}`);
    console.log(`The wind speed is ${data.windSpeed} ${responseUnits.windSpeed}`);
  });

Extend Hourly

Use extendHourly to return hour-by-hour data for the next 168 hours, instead of the next 48.

// turn on
DarkSkyApi.extendHourly(true);
DarkSkyApi.loadForecast()
  .then(console.log);

// turn off
DarkSkyApi.extendHourly(false); 

Post Processor

The post processor method is mapped to all weather items. It's an easy way to add or manipulate responses for an app.

// import
import DarkSkyApi from 'dark-sky-api';

// configure
DarkSkyApi.apiKey = 'my-api-key';
DarkSkyApi.postProcessor = (item) => { // must accept weather data item param

  // add a nice date representation using moment.calender
  item.dayNice = item.dateTime.calendar(null, {
    sameDay: '[Today]',
    nextDay: 'ddd',
    nextWeek: 'ddd',
    lastDay: '[Yesterday]',
    lastWeek: '[Last] ddd',
    sameElse: 'ddd'
  });

  // add units object onto item
  item.units = DarkSkyApi.getResponseUnits(); // this would be outdated if you changed api units later

  return item; // must return weather data item
};

// use 
DarkSkyApi.loadCurrent()
  .then(data => console.log(data.dayNice)); // Today

Time Machine request

To retrieve weather data for a specfic point in time use loadTime. See docs for more info.

DarkSkyApi.loadTime(time, position);

Time can be a moment or a formatted date string.

const time = moment().year(2000);
DarkSkyApi.loadTime(time) // or '2000-04-06T12:20:05' aka moment.format()
  .then(result => console.log(result));

Hourly, Minutely, Alerts, and Flags

To retrieve any of these results use loadItAll with optional excludesBlock. ExcludesBlock indicates which data points to omit.

DarkSkyApi.loadItAll(excludes, position);

DarkSkyApi.loadItAll()
  .then(console.log);

DarkSkyApi.loadItAll('daily,hourly,minutely,flags') // just return alerts

Initialization / Configuration

Tldr: Initialization of the api is automatic, but configure before making api calls.

Static configuration settings such as apiKey, proxyUrl, units, language, and postProcessor are set prior to initialization (configuration phase), locked in during initalization (implicit or explicit), and can be changed after initialization.

Implicit (suggested)

This happens automatically when making a method call such as loadCurrent, loadForecast or loadItAll. Remember to configure beforehand.

// configuration code 
DarkSkyApi.apiKey = 'my-api-key';

// api call somewhere else
DarkSkyApi.loadCurrent(); // initialized automatically

Explicit

DarkSkyApi.apiKey = 'my-api-key';
DarkSkyApi.initialize();

or

DarkSkyApi.initialize(apiKey, proxyUrl, units, language, postProcessor); // only apiKey or proxyUrl are required

Change/set configuration after initialization/use

It's possible to change units, language, postProcessor, extendHourly, and time after initialization. Note: calling any of the static set[Config] methods will initialize the api so make sure you've added a proxy url or api key before using them.

DarkSkyApi.apiKey = 'my-api-key';
DarkSkyApi.loadCurrent();

// config after initialization
DarkSkyApi.setUnits('auto');
DarkSkyApi.setLanguage('x-pig-latin');
DarkSkyApi.setPostProcessor((item) => { 
  return {
    temperature: item.temperatureMax || item.temperature,
    icon: item.icon
  };
});

// can only be set after initialization
DarkSkyApi.extendHourly(true);

Creating an instance

If you need to maintain multiple instances (configurations) of dark-sky-api create an instance.

// import
import DarkSkyApi from 'dark-sky-api';

// instantiate
const api = new DarkSkyApi(apiKey, proxyUrl, units, language, processor); // only apiKey or proxyUrl are required

// instance config methods support method chaining
api.units('us')
  .language('en')
  .postProcessor(item => {
    item.newProp = val;
    return item;
  })
  .loadCurrent()
  .then(console.log);

// extend hourly available for forecasts
api.extendHourly(true)
  .loadForecast()
  .then(console.log);

// turn off extend hourly
api.extendHourly(false)
  .loadForecast()
  .then(console.log);

// change position
position = {
  latitude: 43.075284, 
  longitude: -89.384318
};
api.position(position)
  .loadCurrent()
  .then(console.log);

// change back
api.loadPositionAsync() // get current position
  .then(position => api.position(position));

// time machine request
api.loadTime('2000-04-06T12:20:05')
  .then(console.log)

To Do

• add position validation
• add hourly and minutely api methods
• add flags and alerts api methods
• add tests