Worshipping God is the purpose of the creation of jinn and mankind.

وَمَا خَلَقْتُ الْجِنَّ وَالْإِنْسَ إِلَّا لِيَعْبُدُونِ ﴿۵۶﴾

سورة الذاریات المبارکة

I did not create the jinn and the humans except that they may worship Me.

(Surah Az-Zariat Verse 56)