Question

I am constructing a JSON object with nested objects in Javascript. Is there an easy way to do this in Javascript without using eval()?

var data_json = "data = {'"+field_name+"':{'answers':{";
for(var i=0; i<answers.length; i++){
    data_json += "'" + i + "':" + "'" + answers[i] + "',";
}
data_json = data_json.replace(/,$/,"");
data_json = data_json + "}}}";

eval(data_json);

Result:

data={'myfield':{'answers':{'0':'The answer', '1':'Another answer'}}};

Answer 1

var a, data = {};
data[field_name] = { "answers" : { } };
a = data[field_name]["answers"];

for(var i=0; i<answers.length; i++){
   a[i] = answers[i];
}


console.log(data);

As a side note, if data[field_name]["answers"] contains numeric keys only, it should be an array and not an object, so data[field_name] should be = { "answers" : [ ]};