Error: JSON.parse: unexpected character at line 2 column 1 of the JSON data

Question

I have function which return json data

transformResponse : function(data) {
   return JSON.parse(data).results;
 }

When function call it getting error

Error: JSON.parse: unexpected character at line 2 column 1 of the JSON data

If their is no data then JSON.parse(data).results [ ] empty. I think the error is due to this [ ] object

So how to check is return empty is json or not??

Answer 1

test the return of json parse before you try to access to an element // edit, added test

var transformResponse  = function(data){
    if(( typeof data !== undefined) && ( typeof data !== 'undefined') && ( data !== null ) && (data !== "")){
        var d = JSON.parse(data) ;

        if(( typeof d !== undefined)&&(d!=null)){
            return d.results;
        }else{
            return null;
        }
    }else{
        return null;
    }

};

Answer 2

transformResponse : function(data) {
   var responseData = JSON.parse(data);
   return (responseData && responseData.results) ? responseData.results:null;
 }

if responseData does'nt have results or empty it will return null else results array.