var nodes=[];
$.getJSON('/get/data', function(data) {
            nodes.push(data);
        });
//debugger
console.log(nodes);
console.log(nodes[0]);

[ ]
undefined

[]
  []
  []
 [[Object { id=10,  label="foo"}, Object { id=9,  label="bar"}, 43 more...]]
 [Object { id=10,  label="foo"}, Object { id=9,  label="bar"}, ...]