How to convert object's field name to value in Javascript

Question

I'm trying to convert an object like {fieldName: "value"} into another object like {field: "fieldName", value: "value"} in the simplest way possible, without knowing what the fieldName is in advance.

I've looked at the answer to How to convert string as object's field name in javascript but although this works it relies on the fact that the fieldName is already known. The following works:

const key = Object.keys(searchObject)[0];
  return { field: key, value: searchObject[key] }

But it looks unwieldy, clunky and error-prone. What I would like is the equivalent of

const obj = { field: [searchObject.key], ... }

But this only works where [searchObject.key] is the value of searchObject.key.

You might be interested in Object.entries()

Seblor
– Seblor

2019-10-03 13:01:01 +00:00
Commented Oct 3, 2019 at 13:01 — Seblor
– Seblor, Commented Oct 3, 2019 at 13:01

Luis felipe De jesus Munoz · Accepted Answer · 2019-10-03 12:58:17Z

2

Iterate over each property in your object and create another one with the key and value as separated properties, then push it to a new array and return it.

Example:

var test_data = {fieldName: "name", fieldName2: "name2"}

function convert(data){
  var result = []
  for(var k in data){
    result.push({
      field: k,
      value: data[k]
    })
  }
  return result
}

console.log(convert(test_data))

// ------ ES6 ---------- //

console.log(
  Object.keys(test_data).map(a=>({field: a, value: test_data[a]}))
)

answered Oct 3, 2019 at 12:58

Luis felipe De jesus Munoz

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1 Comment

excatholica Over a year ago

The ES6 looks ok, but I'm trying to avoid an array solution. Perhaps that's the best result.

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