Download but only on the sound

[jins]

How can I only download in mp3, there's no api doc or anything like that?

Thanks

[Saahil]

just change the file paths from .mp4 to .mp3 and remove anything else
node script

// run in the output dir
require('fs').readdirSync(__dirname).forEach(f => {
require('child_process').execSync(`mv ${f} ${f.replace('.mp4','.mp3')`)
})