Endpoint: https://suggestqueries.google.com/complete/search
Method: GET

URL-Parameter:
client=youtube
jsonp=JP (JSON padding)
ds=yt
hl=de (language)
gl=DE (counry)
q=hello (query)


YouTube Music:
Endpoint: https://music.youtube.com/youtubei/v1/music/get_search_suggestions?key=AIzaSyC9XL3ZjWddXya6X74dJoCTL-WEYFDNX30&prettyPrint=false

Request:
{
    context: ...,
    input: "hello"
}