npm install dark-sky --save

const DarkSky = require('dark-sky')
const darksky = new DarkSky(process.env.DARK_SKY) // Your API KEY can be hardcoded, but I recommend setting it as an env variable.


// Example 1 - Method chaining, as promise.
darksky
    .latitude('37.8267')            \\ required: latitude, string || float.
    .longitude(-122.423)            \\ required: longitude, string || float.
    .time('2016-01-28')             \\ optional: date, string 'YYYY-MM-DD'.
    .units('ca')                    \\ optional: units, string, refer to API documentation.
    .language('en')                 \\ optional: language, string, refer to API documentation.
    .exclude('minutely,daily')      \\ optional: exclude, string || array, refer to API documentation.
    .extendHourly(true)             \\ optional: extend, boolean, refer to API documentation.
    .get()                          \\ execute your get request.
    .then(console.log)
    .catch(console.log)             \\ handle your error response.

// Example 2 - Setting coordinates shorthand, as promise.
darksky
    .coordinates({lat: 37.8267, lng: -122.423})
    .units('ca')
    .language('en')
    .exclude('minutely,daily')
    .get()
    .then(console.log)
    .catch(console.log)

// Example 3 - Setting options shorthand, as promise.
darksky
    .options({
        latitude: 37.8267,
        longitude: -122.423,
        time: '2017-08-10',
        language: 'en',
        exclude: ['minutely', 'daily'],
        extendHourly: true
    })
    .get()
    .then(console.log)

// Example 4 - Modern endpoint example, as async/await.

app.use('/a-week-ago', async (req, res, next) => {
  try {
    const { latitude, longitude } = req.body
    const forecast = await darksky
      .options({
        latitude,
        longitude,
        time: moment().subtract(1, 'weeks')
      })
      .get()
    res.status(200).json(forecast)
  } catch (err) {
    next(err)
  }
})