String to object in Javascript -

i have function working fine:

function sendleaddata(form) {     return trk(form, {         firstname: "pan",     }); } 

{firstname : "pan"} = object. if set var , pass var in function works fine. need use string building map , pass that. getting string perfect .code below not working:

function sendleaddata(form) {     //code str     alert("str "+str);------->prints str perfect,also giving result below     var obj = json.parse(str);//if except str put json.parse(json.stringify({firstname:"pan"})) work fine     alert("obj "+obj);      return trk(form,         obj     ); } 

str prints "{firstname:"pan"}". error syntax error thrown.

please help.

json has more strict object representation. keys need quoted:

'{"firstname": "pan"}'