How do I spawn a zombie wearing a helmet?

I want to spawn a zombie wearing a helmet but every time I try it, it ends up holding the helmet instead of wearing it. What command do I use to make the zombie wear the helmet instead of hold it, if I'm playing version 1.10?

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1 Answer

The trick is to specify the equipment as an array.

/summon Zombie ~0 ~1 ~0 {ArmorItems:[{},{},{},{id:diamond_helmet}]}

The full command to summon mobs with gear is this (as of version 1.9):

/summon Zombie ~0 ~1 ~0 {HandItems:[{Mainhand},{Off-Hand}],ArmorItems:[{Feet},{Legs},{Chest},{Head}]}

To specify an item use its minecraft name (diamond_helmet for example) instead of their id.
Here is a list.

PS: You can equip (almost) any item, not just armor.