Convert json format to another json format by AngularJS

Question

I'm trying to implement a questionnaire with angularjs,So I have the following response array ,I need to convert this object array to json format like the following output, So How can I convert object array to json format?

 var response=[{"questiongroup":1,"question":1,"response":"response1"},
                     {"questiongroup":1,"question":2,"response":"response2"},
                     {"questiongroup":1,"question":3,"response":"response3"},
                     {"questiongroup":1,"question":4,"response":"response4"},
                     {"questiongroup":1,"question":5,"response":"response5"},
                     {"questiongroup":2,"question":6,"response":"response6"},
                     {"questiongroup":2,"question":7,"response":"response7"},
                     {"questiongroup":2,"question":8,"response":"response8"},
                     {"questiongroup":2,"question":9,"response":"response9"},
                     {"questiongroup":2,"question":10,"response":"response10"}];

desired output

   {"questiongroups": [
                       {
                         "questiongroup": 1,
                         "question": [
                           {
                             "question": 1,
                             "response":"response1"
                           },
                           {
                             "question": 2,
                             "response":"response2"
                            },
                            {
                             "question": 3,
                             "response":"response3"
                             },
                            {
                             "question": 4,
                             "response":"response4"
                              },
                             {
                              "question": 5,
                              "response":"response5"
                             }]
                         },
                         {
                             "questiongroup": 2,
                             "question": [
                               {
                                 "question": 6,
                                 "response":"response6"
                               },
                               {
                                 "question": 7,
                                 "response":"response7"
                                },
                                {
                                 "question": 8,
                                 "response":"response8"
                                 },
                                {
                                 "question": 9,
                                 "response":"response9"
                                  },
                                 {
                                  "question": 10,
                                  "response":"response10"
                                 }]
                             }
                         ]
                    }

Sorry, I was too hasty in marking this as a duplicate -- it appears that you're not asking how to convert this object to JSON, you're asking how to rearrange the data into a different structure. — Daniel Beck
– Daniel Beck, Commented Aug 4, 2016 at 16:22
Have you tried anything? Data mutation like this is very common. — Mike Cluck
– Mike Cluck, Commented Aug 4, 2016 at 16:41

tpsilva · Accepted Answer · 2016-08-04 16:41:04Z

The fastest solution that came to me.

Reduces the response to a object with the questiongroup being the ids of the arrays. Then, to return as you want, mapped the keys to generate the array and created the object with the questiongroups value.

var response=[{"questiongroup":1,"question":1,"response":"response1"},
                     {"questiongroup":1,"question":2,"response":"response2"},
                     {"questiongroup":1,"question":3,"response":"response3"},
                     {"questiongroup":1,"question":4,"response":"response4"},
                     {"questiongroup":1,"question":5,"response":"response5"},
                     {"questiongroup":2,"question":6,"response":"response6"},
                     {"questiongroup":2,"question":7,"response":"response7"},
                     {"questiongroup":2,"question":8,"response":"response8"},
                     {"questiongroup":2,"question":9,"response":"response9"},
                     {"questiongroup":2,"question":10,"response":"response10"}];

var questiongroups = response.reduce(function(groups, question){
  var group = groups[question.questiongroup] || [];
  group.push({
    question: question.question,
    response: question.response
  });

  groups[question.questiongroup] = group;
  
  return groups;
}, {});

questiongroups = Object.keys(questiongroups).map(function (key) {return {questiongroup: key, question: questiongroups[key]}});

var object = {
  questiongroups: questiongroups
};

console.log(object);

Danny Buonocore · Accepted Answer · 2016-08-04 16:50:29Z

var response=[{"questiongroup":1,"question":1,"response":"response1"},
                     {"questiongroup":1,"question":2,"response":"response2"},
                     {"questiongroup":1,"question":3,"response":"response3"},
                     {"questiongroup":1,"question":4,"response":"response4"},
                     {"questiongroup":1,"question":5,"response":"response5"},
                     {"questiongroup":2,"question":6,"response":"response6"},
                     {"questiongroup":2,"question":7,"response":"response7"},
                     {"questiongroup":2,"question":8,"response":"response8"},
                     {"questiongroup":2,"question":9,"response":"response9"},
                     {"questiongroup":2,"question":10,"response":"response10"}];

var result = {
	"questiongroups": [],
}

var group = {
	"questiongroup": 1,
  "question": []
}

for (var i in response) {

	if (response[i].questiongroup != group.questiongroup) {
  	result.questiongroups.push(group);
    group = {
    "questiongroup" : response[i].questiongroup,
  	"question": []
    };
  }
  
  var entry = {
    "question" : {
      "question" : response[i].question,
      "response" : response[i].response
    }
  }
  
  group.question.push(entry);
}

result.questiongroups.push(group);

console.log(result);

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