Add a new attribute to json object [duplicate]

Question

I have a JSON object of the following format

[{"field1":1,"field2":"A","field3":"B"},
{"field1":2,"field2":"B","field3":"C"},
{......},
{......},
]

I need to add a new attribute to each row based on some calculations.

Expected result

[{"field1":1,"field2":"A","field3":"B","field4"="generatedVal1"},
    {"field1":2,"field2":"B","field3":"C","field4"="generatedVal2"},
    {......},
    {......},
    ]

How can I achieve this using javascript?

JSON is a textual notation for data exchange. (More) If you're dealing with JavaScript source code, and not dealing with a string, you're not dealing with JSON. I give it about 99% odds you're not dealing with JSON. — T.J. Crowder
– T.J. Crowder, Commented Oct 2, 2016 at 7:26

dfsq · Accepted Answer · 2016-10-02 07:25:43Z

2

Use Array.prototype.forEach method:

[
  {"field1":1,"field2":"A","field3":"B"},
  {"field1":2,"field2":"B","field3":"C"}
]
.forEach(obj => {
  obj.field4 = 'Something'
})

Sidenote on terminology: you don't have any JSON, you have javascript array (object). JSON is a string representation of this object, but in your question you are talking about object itself.

edited Oct 2, 2016 at 7:25

answered Oct 2, 2016 at 7:23

dfsq

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