ytmp3mobi [youtube] [downloader] [audio] [video] [dl.ymcdn.org]

(async () => {

  // main function, return object, throws error, param string youtube videos url and string format mp3 or mp4 (opsional)
  let ytmp3mobi = async (youtubeUrl, format="mp3") => {

    // param 1 validation
    const regYoutubeId = /https:\/\/(www.youtube.com\/watch\?v=|youtu.be\/|youtube.com\/shorts\/|youtube.com\/watch\?v=)([^&|^?]+)/
    const videoId = youtubeUrl.match(regYoutubeId)?.[2]
    if (!videoId) throw Error("cant extract youtube video id from given link. please check your youtube link")

    // param 2 validation
    const availableFormat = ["mp3", "mp4"]
    const formatIndex = availableFormat.findIndex( v => v == format.toLocaleLowerCase())
    if (formatIndex == -1) throw Error (`${format} is invalid format, available format : ${availableFormat.join(", ")}. pick one!`)


    const urlParam = {
      v: videoId, // your youtube video id 0OjISWlmM9k (example)
      f: format, // or mp4 if you want to download video
      _: Math.random()
    }

    const headers = {
      "Referer": "https://id.ytmp3.mobi/",
    }

    const fetchJson = async (url, fetchDescription) => {
      const res = await fetch(url, { headers })
      if (!res.ok) throw Error(`fetch failed on ${fetchDescription} | ${res.status} ${res.statusText}`)
      const json = await res.json()
      return json
    }

    const { convertURL } = await fetchJson("https://d.ymcdn.org/api/v1/init?p=y&23=1llum1n471&_=" + Math.random(), "get convertURL")

    const { progressURL, downloadURL } = await fetchJson(`${convertURL}&${new URLSearchParams(urlParam).toString()}`, "get progressURL and downloadURL")

    let { error, progress, title } = {}

    while (progress != 3) {
      ({ error, progress, title } = await fetchJson(progressURL, "fetch progressURL"))
      if (error) throw Error(`error found in json object after fetch progressURL, here the value of error key : ${error}`)
      let statusToPrint = progress == 1 ? "[loading]" : progress == 2 ? "[converting]" : progress == 2 ? "[ready]" : "[unkonwn]"
      statusToPrint += ` ${title}`
      console.log(statusToPrint)
    }

    const result = { title, downloadURL }

    return result
  }

  // how to use
  const youtubeUrl = "https://www.youtube.com/watch?v=WK-PlNz52FM&t=208s"

  ytmp3mobi(youtubeUrl) // or ytmp3mobi(youtubeUrl, "mp4") to download video, second param is optional, its mp3 by default if its not specified
    .then(data => console.log(data))
    .catch(error => console.log(error.message))

})()

/* output
{
  title: 'G Sounds - point the star 2',
  downloadURL: 'https://dl.ymcdn.org/3d3bc76ebca890a1b0d12395b8171e00/Hlyb9urvzck'
}
*/