Scrape connect.garmin.com sleep data

sleep.js

(async () => {

    const dateStr = (dateObj) => `${dateObj.getUTCFullYear()}-${String(dateObj.getUTCMonth() + 1).padStart(2, '0')}-${String(dateObj.getUTCDate()).padStart(2, '0')}`

    const getData = async (dateObj) => {
        const date = dateStr(dateObj)
        const username = ''

        const resp = await fetch(`https://connect.garmin.com/modern/proxy/wellness-service/wellness/dailySleepData/${username}?date=${date}&nonSleepBufferMinutes=60`, {
          "headers": {
            "accept": "application/json, text/plain, */*",
            "accept-language": "en-US,en;q=0.9",
            "nk": "NT",
            "sec-fetch-dest": "empty",
            "sec-fetch-mode": "cors",
            "sec-fetch-site": "same-origin",
            "sec-gpc": "1",
            "x-app-ver": "4.44.3.0"
          },
          "referrer": `https://connect.garmin.com/modern/sleep/${date}`,
          "referrerPolicy": "strict-origin-when-cross-origin",
          "body": null,
          "method": "GET",
          "mode": "cors",
          "credentials": "include"
        });
        return resp.json()
    }

    const table = (objects) => {
        const keys = Array.from(new Set(objects.flatMap(o => Object.keys(o))))
        let str = keys.join(',') + '\n'
        str += objects.map(o => keys.map(k => o[k]).join(',')).join('\n')
        return str
    }


    const startDate = '2021-01-01'
    const endDate = '2021-07-08'

    const dates = []
    let i = new Date(startDate)
    while(i <= new Date(endDate)) {
        dates.push(i)

        i = new Date(i)
        i.setUTCDate(i.getUTCDate() + 1)
    }
    
    const results = await Promise.all(dates.map(async d => {
        const res = await getData(d)
        const { 
            awakeSleepSeconds, 
            deepSleepSeconds, 
            lightSleepSeconds, 
            remSleepSeconds, 
            sleepTimeSeconds, 
            unmeasurableSleepSeconds
        } = res.dailySleepDTO
        return {
            date: dateStr(d),
            awakeSleepSeconds, 
            deepSleepSeconds, 
            lightSleepSeconds, 
            remSleepSeconds, 
            sleepTimeSeconds, 
            unmeasurableSleepSeconds
        }
    }))

    console.log(table(results))

})()