And what is with JSON?

And what is with JSON?

JSON found in many usage, as well as me.
Thats nice about that getJSON or parseJSON a JSON string is converted to an object, but what about the other direction?

Constantly (and especially if you are constantly working with JSON) you have to make sure that you use a reasonable parser - Because if you want to convert objects to JSON, one must necessarily use a plugin.

Why is this not built into the core?