I'm going to stay overnight at a friend's without my parents permission
Why don't you want to get your parent's permission?
So I can have more fun.
It's not good to habitually lie to your parents, but growing up sometimes kids will omit certain things as part of the process of growing up. What are you going to tell them when you come home and they ask where you were all night?
I will tell them that I spent the night at a friend's.
Well at least you're going to be honest if they ask, but you should just be upfront with them about it in the first place.