weather-scraper/scrapers/OpenMeteo.js

const FORMAT = {
    hourly: {
        temperature: {
            type: 'number',
            unit: '°C',
        },
        precipitation: {
            type: 'number',
            unit: 'mm',
        },
        precipitationProbability: {
            type: 'number',
            unit: '%',
        },
        apparentTemperature: {
            type: 'number',
            unit: '°C',
        },
        weatherCode: {
            type: 'number',
            unit: 'WMO code',
        },
    },
    daily: {
        minimumTemperature: {
            type: 'number',
            unit: '°C',
        },
        maximumTemperature: {
            type: 'number',
            unit: '°C',
        },
        minimumApparentTemperature: {
            type: 'number',
            unit: '°C',
        },
        maximumApparentTemperature: {
            type: 'number',
            unit: '°C',
        },
        precipitationSum: {
            type: 'number',
            unit: 'mm',
        },
        weatherCode: {
            type: 'number',
            unit: 'WMO code',
        },
    },
}

const getDailyData = async () => {
    const response = await fetch(
        'https://api.open-meteo.com/v1/forecast?latitude=43.7085&longitude=10.4036&hourly=temperature_2m,relative_humidity_2m,apparent_temperature,precipitation,precipitation_probability,weather_code&timezone=Europe%2FBerlin&forecast_days=3',
    )
    const body = await response.json()

    const dataAt = (body, i) => {
        return {
            temperature: body.hourly.temperature_2m[i],
            precipitation: body.hourly.precipitation[i],
            precipitationProbability: body.hourly.precipitation_probability[i],
            apparentTemperature: body.hourly.apparent_temperature[i],
            weatherCode: body.hourly.weather_code[i],
        }
    }

    let today = {}
    const startTime = new Date().getHours() + 1
    for (let i = startTime; i <= 23; i++) {
        today[i] = dataAt(body, i)
    }

    let tomorrow = {}
    for (let i = 0; i <= 23; i++) {
        tomorrow[i] = dataAt(body, 24 + i)
    }

    let dayAfterTomorrow = {}
    for (let i = 0; i <= 23; i++) {
        dayAfterTomorrow[i] = dataAt(body, 48 + i)
    }
    return {
        today,
        tomorrow,
        dayAfterTomorrow,
    }
}

const getWeekData = async () => {
    const response = await fetch(
        'https://api.open-meteo.com/v1/forecast?latitude=43.7085&longitude=10.4036&daily=weather_code,temperature_2m_max,temperature_2m_min,apparent_temperature_max,apparent_temperature_min,precipitation_sum,precipitation_probability_max&timezone=Europe%2FBerlin',
    )
    const body = await response.json()

    let week = {}
    for (let i = 0; i <= 6; i++) {
        week[i] = {
            minimumTemperature: body.daily.temperature_2m_min[i],
            maximumTemperature: body.daily.temperature_2m_max[i],
            minimumApparentTemperature: body.daily.apparent_temperature_min[i],
            maximumApparentTemperature: body.daily.apparent_temperature_max[i],
            precipitationSum: body.daily.precipitation_sum[i],
            precipitationProbabilityMax:
                body.daily.precipitation_probability_max[i],
            weatherCode: body.daily.weather_code[i],
        }
    }

    return week
}
export default async () => {
    const [daily, week] = await Promise.all([getDailyData(), getWeekData()])

    return {
        format: FORMAT,
        ...daily,
        week,
    }
}