filter json based on key value

Question

I have the below JSON data. I want to filter based on Key value pairs that is based on Department and Employee

 var data = {
    "Item": [
        {
            "Fields": [
              {
                  "Key": "Title",
                  "Value": ""
              },
              {
                  "Key":"Name",
                  "Value":"Phani"
              },
              {  
                  "Key":"Designation",
                  "Value":"Software Eng"
              },
              {  
                  "Key":"Salary",
                  "Value":""
              },
              {  
                  **"Key":"Section",**
                  "Value":"Employee"
              }], "ItemName": "Test"
        },

         {
             "Fields": [
               {
                   "Key": "Title",
                   "Value": ""
               },
               {
                   "Key": "Name",
                   "Value": "Raju"
               },
               {
                   "Key": "Designation",
                   "Value": "Software Eng"
               },
               {
                   "Key": "Salary",
                   "Value": ""
               },
               {
                   "Key": "Section",
                   "Value": "Employee"
               }], "ItemName": "Test"
         },
         {
             "Fields": [
               {
                   "Key": "Title",
                   "Value": ""
               },
               {
                   "Key": "DepName",
                   "Value": "Finance"
               },
               {
                   "Key": "DepType",
                   "Value": "Money"
               },
               {
                   "Key": "Salary",
                   "Value": ""
               },
               {
                   "Key": "Section",
                   "Value": "Department"
               }], "ItemName": "Test"
         },
         {
             "Fields": [
               {
                   "Key": "Title",
                   "Value": ""
               },
               {
                   "Key": "DepName",
                   "Value": "IT"
               },
               {
                   "Key": "DepType",
                   "Value": "Tech"
               },
               {
                   "Key": "Salary",
                   "Value": ""
               },
               {
                   "Key": "Section",
                   "Value": "Department"
               }], "ItemName": "Test"
         }



    ]


};

In the above json data if you observe in Fields array i have key value pairs There is a key with name Section and its value.

I want to filter the data based on Section, like i want to list all the employees and all the departments. Confused about iterating. could you please help with this.

I want two objects ans output var emps =[] var deps=[]

so that i can iterate and access like emp["Designation"] emp["Name"] dep["DepName"] etc

Answer 1

One way of doing it would be:

var result = {};
data.Item.forEach(function(item){
var fields = item.Fields;
var res = {};
for(var i=0;i<fields.length;i++)
{
  res[fields[i].Key] = fields[i].Value;
}
if(!result.hasOwnProperty(res.Section)){
 result[res.Section] = [];
}
 result[res.Section].push(res);
})
console.log(result);

o/p:

{ Employee: 
   [ { Title: '',
       Name: 'Phani',
       Designation: 'Software Eng',
       Salary: '',
       Section: 'Employee' },
     { Title: '',
       Name: 'Raju',
       Designation: 'Software Eng',
       Salary: '',
       Section: 'Employee' } ],
  Department: 
   [ { Title: '',
       DepName: 'Finance',
       DepType: 'Money',
       Salary: '',
       Section: 'Department' },
     { Title: '',
       DepName: 'IT',
       DepType: 'Tech',
       Salary: '',
       Section: 'Department' } ] }

You can access each employee as result.Employee[i].Title and department as result.Department[0].Title.

Answer 2

This should give you an idea:

var firstFields = data.Item[0].Fields.map(function(field){
    return { key: field.Key, value: field.Value };
});

console.log(firstFields);

map() the data and create the structure that you prefer.

I will update with an example on how to differentiate between employees and departments.

http://jsfiddle.net/kwpy35hg/

Update:

// filter out departments
var departments = data.Item.filter(function(item){
    var section = item.Fields[item.Fields.length -1];
    return section.Value === 'Department';
});


// flatten result:
deps = [];
for(var i = 0; i < departments.length; i++){

    for(var j = 0; j < departments[i].Fields.length; j++){
        deps.push({ key: departments[i].Fields[j].Key, 
                    value: departments[i].Fields[j].Value })
    }


}
console.dir(deps);

http://jsfiddle.net/kwpy35hg/1/

To get departments as 2 arrays:

var departments = data.Item.filter(function(item){
    var section = item.Fields[item.Fields.length -1];
    return section.Value === 'Department';
}).map(function(deps){
    return deps.Fields;
});