Minecraft how to Make Hostile Mobs Friendly?

How do you Make Mobs not Hostile in Minecraft?

There just use the command "mobdamage" (without quotation marks).

How do you Stop Mobs from Attacking You?

Turn the difficulty of the survival game to peaceful. This prevents any mobs from spawning and removes all current ones.
Change to creative game mode. Mobs will still spawn, but they cannot attack you.
Hiding the upper half of the mob.
Mods/Commands.