index.js

const express = require("express")
const ytdl = require("@distube/ytdl-core")
const fetch = require("node-fetch")
const fs = require("fs")
const path = require("path")
const tmp = require("tmp")

const app = express()
app.use(express.json())

app.get("/download", async (req, res) => {
  const url = req.query.url
  const type = req.query.type || "video"
  if (!url) return res.status(400).json({ error: "url required" })

  const cookieHeader = process.env.YT_COOKIE

  try {
    const info = await ytdl.getInfo(url, {
      requestOptions: { headers: { Cookie: cookieHeader } }
    })

    let ryd = {}
    try {
      const r = await fetch(`https://returnyoutubedislikeapi.com/votes?videoId=${info.videoDetails.videoId}`)
      ryd = await r.json()
    } catch {}

    const metadata = {
      title: info.videoDetails.title,
      uploader: info.videoDetails.author.name,
      duration: info.videoDetails.lengthSeconds,
      views: info.videoDetails.viewCount,
      likes: info.videoDetails.likes,
      dislikes: ryd.dislikes || 0,
      videoId: info.videoDetails.videoId
    }

    const tmpFile = tmp.fileSync({ postfix: type === "audio" ? ".mp3" : ".mp4" })
    const stream = ytdl.downloadFromInfo(info, {
      requestOptions: { headers: { Cookie: cookieHeader } },
      quality: "highest",
      filter: type === "audio" ? "audioonly" : "audioandvideo"
    })

    stream.pipe(fs.createWriteStream(tmpFile.name))
    stream.on("end", () => {
      res.json({
        metadata,
        download_url: `/file?path=${encodeURIComponent(tmpFile.name)}`
      })
    })
  } catch (e) {
    res.status(500).json({ error: e.message })
  }
})

app.get("/file", (req, res) => {
  const filePath = req.query.path
  if (!filePath || !fs.existsSync(filePath)) return res.status(404).json({ error: "file not found" })
  res.download(filePath, path.basename(filePath), () => {
    fs.unlinkSync(filePath)
  })
})

app.listen(process.env.PORT || 8000, () => console.log(`Server running on port ${process.env.PORT || 8000}`))