JSON does not define a type system, but javascript defines null as the only value of the null type. This works fine in eg typescript since you can use a type union of null and any other type, if you want to indicate a nullable value.

Don't forget in addition to null, javascript has undefined and undefined.

(the value undefined and the property-does-not-exist undefined)

but don't forget that `typeof null === 'object'` :)

They're null pointer objects /s