Insert key in Json using Javascript

Question

In the case of my json format as below

var  names = ['Lee' , 'Cooper'];

How can javascript programatically set the json output to below ?

{"suggestions": ['Lee', 'Cooper']}

I know to modify the value for names[0] from 'Lee' to something else. But I am not sure on how to set key. This is a pre-requisite for jquery autocomplete where the json format must be in the correct way.

Answer 1

var  names = ['Lee' , 'Cooper'];
{suggestions: names}

Answer 2

var  names = ['Lee' , 'Cooper'];
var arr = [];
arr.push({selection:names});
result = JSON.stringify(arr);