How to modify or change a particular object from JSON array?

Question

Suppose I have a JSON array like:

[{
    "box": "box1",    
    "parent": [{
        "id": "box0"
    }],
    "child": [{
        "id": "box2"
    }]
},{
    "box": "box2",
    "parent": [{
        "id": "box1"
    }],
    "child": [{
        "id": "box3"
    },{
        "id": "box4"
    }]
}]

Now assume that I want to change a value parent id of box2 then how do I do that.

How can I specifically change a particular value?

What about deserializing this JSON string to an object, change the value in the object and then serializing this object ? — PMerlet
– PMerlet, Commented Oct 7, 2015 at 7:42

orllando · Accepted Answer · 2015-10-07 07:52:38Z

1

var arr = [{
  'box': 'box1',
  'parent': [{
    'id': 'box0'
  }],
  'child': [{
    'id': 'box2'
  }]
}, {
  'box': 'box2',
  'parent': [{
    'id': 'box1'
  }],
  'child': [{
    'id': 'box3'
  }, {
    'id': 'box4'
  }]
}];

arr = arr.map(function(box) {
   if (box.box === 'box2') {
     box.parent = [{ id: 'box0' }];
   }
  
   return box;
      
});

console.log(arr);

answered Oct 7, 2015 at 7:52

orllando

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2 Comments

Arti Over a year ago

Thank you for the quick reply. But this is to add a new value. I also would like to edit existing value and delete a particular value.

orllando Over a year ago

You could already do anything with the filtered box object. Don't rely on SO for everything you need to do.

PMerlet · Accepted Answer · 2015-10-07 07:55:03Z

0

You can deserialize this JSON string into a javascript object, modify the property in the object and then serializing the javascript object into a JSON string :

var json = '[{"box":"box1","parent":[{"id":"box0"}],"child":[{"id":"box2"}]},{"box":"box2","parent":[{"id":"box1"}],"child":[{"id":"box3"},{"id":"box4"}]}]';
var obj = JSON.parse(json);
obj[1].parent[0].id = "whatever";
var newjson = JSON.stringify(obj);

answered Oct 7, 2015 at 7:55

PMerlet

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