PhantomJS JSON.parse() fails on array

test.sh

         
$ phantomjs
phantomjs> a = '[{"foo":"bar"},{"foo":"cat"}]'
"[{\"foo\":\"bar\"},{\"foo\":\"cat\"}]"
phantomjs> JSON.parse(a)
{
   "0": {
      "foo": "bar"
   },
   "1": {
      "foo": "cat"
   }
}

         
$ node
> a = '[{"foo":"bar"},{"foo":"cat"}]'
'[{"foo":"bar"},{"foo":"cat"}]'
> JSON.parse(a)
[ { foo: 'bar' }, { foo: 'cat' } ]
> 
(^C again to quit)
>