JSON Object to Arrays

Question

Below JSON Object needs to be iterated and need result as below.

[
  {"Aazam":1, "Jagannath":2, "Bharath Kumar M":4 },
  {"Bharath Kumar M":1, "Syad":1 },
  {"Bharath Kumar M":2 }
]

output needed (can be in map):

Aazam: 1
Jagannath: 2
Bharath Kumar M: 4, 1, 2
Syad: 1

I tried with ES 6 syntax, I am able to get key and values but I am not successful in forming the array as needed.

Solution should be generic.

if you've got some code you tried, then in order to fix it we will need to see it, please. And also give a clear description of what goes wrong with it current (errors, warnings, unexpected behaviour, that kind of thing). Thanks. — ADyson, Sep 04 '18 at 14:24
@MKougiouris That's not JSON -> [javascript - What is the difference between JSON and Object Literal Notation?](https://stackoverflow.com/questions/2904131/what-is-the-difference-between-json-and-object-literal-notation) — Andreas, Sep 04 '18 at 14:26
_I tried with ES 6 syntax, I am able to get key and values but I am not successful in forming the array as needed_.... Post what you've tried, please. — lealceldeiro, Sep 04 '18 at 14:28
@Andreas jsonlint.com, json.parser.online.fr, ... it is JSON alright.. its just not in a string variable.. but the representation, if it were an actualy string, would be a json — MKougiouris, Sep 04 '18 at 14:37
@Andreas put this in a fiddle var jstring= '[{"Aazam":1,"Jagannath":2,"Bharath Kumar M":4},{"Bharath Kumar M":1,"Syad":1},{"Bharath Kumar M":2}]'; var demo = JSON.parse(jstring) Its just a copy of his posted code, with added quotes to string it — MKougiouris, Sep 04 '18 at 14:39
@MKougiouris Please check the link I've posted. There's a huge an distinctive difference between an object and a string representation of such an object, a.k.a JSON. — Andreas, Sep 04 '18 at 14:40

score 1 · Accepted Answer · answered Sep 04 '18 at 14:29

You can have a object as a output with the unique keys and values for each key as an array that holds the values of all similar keys.

var arr = [{
    "Aazam": 1,
    "Jagannath": 2,
    "Bharath Kumar M": 4
  },
  {
    "Bharath Kumar M": 1,
    "Syad": 1
  },
  {
    "Bharath Kumar M": 2
  }
];

var res = arr.reduce((acc, item) => {
  var keys = Object.keys(item);
  keys.forEach((key) => {
    if (!acc[key]) {
      acc[key] = [];
    }
    acc[key].push(item[key]);
  });
  return acc;
}, {});
console.log(res);

JSON Object to Arrays

1 Answers1