EDIT: more mob switch types https://youtu.be/0Y0QBzfMtes
►Farm everything document: http://bit.ly/FarmEverything
I show how to make a peaceful mode switch for smp and ssp. It allows the turning off and on of hostile mobs spawns in your world! I designed this last year for the withergrave but never got around to showing it. Relogging in ssp can cause mobs to spawn in some situations. Enjoy!