Can a Javascript Object be created without quotes around the key -

i'm trying use datamaps charting library , came across notation data:

var map = new datamap({         element: document.getelementbyid('container'),         fills: {             high: '#afafaf',             low: '#123456',             medium: 'blue',             unknown: 'rgb(0,0,0)',             defaultfill: 'green'         },         data: {             irl: {                 fillkey: 'low',                 numberofthings: 2002             },             usa: {                 fillkey: 'medium',                 numberofthings: 10381             }         }     }); 

if want place object in "data" attribute, cannot - because country code not wrapped in quotes.

how build data such scenarios?

[edit]
here's json create in controller , send using rest callout:

{"usa":{"value":"15000.0","countryname":"usa"}} 

i changing following match way library accepts data:

{usa:{fillkey : 'low'}} 

for using json.parse(), needs data in proper json format, like:

{"usa":{"fillkey" : "low"}} 

(note absence of quotes around usa)

currently, i'm using create datamap:

var dataforchart = builddataforchart();// outputs string "{usa:{fillkey : 'low'}}"    var map = new datamap({         element: document.getelementbyid('container'),         fills: {             high: '#afafaf',             low: '#123456',             medium: 'blue',             unknown: 'rgb(0,0,0)',             defaultfill: 'green'         },         data: dataforchart     }); 

but doesn't seem work.

try

var options = {     element: ...,     fills: ...,     data: {         irl: {             fillkey: 'low',             numberofthings: 2002         },         usa: {             fillkey: 'medium',             numberofthings: 10381         }     } }  options.data.can = { fillkey: 'high', numberofthings: 4201 };  var map = new datamap(options);