The description of the shocking grasp cantrip says:
Make a melee spell attack against the target. You have advantage on the attack roll if the target is wearing armor made of metal. On a hit, the target takes 1d8 lightning damage, and it can’t take reactions until the start of its next turn.
How much damage do I deal with shocking grasp? Would it do 1d8 (+ spellcasting modifier) damage? Or would it do 1d6 + (attack modifier) in addition to the 1d8 roll?
I am assuming that, as it's a cantrip, it's just the 1d8 lightning damage, but I want to check because it's unclear to me.