getting nested value by using node js / javascript

Question

let data =
 [
    {
        "testingNewValue": {
            "en-US": "hello"
        }
    },
    {
        "testingNewValue": {
            "hi-IN": "hello "
        }
    },
    {
        "testingNewValue": {
            "us": "dummy"
        }
    },
    {
        "testingNewValue": {
            "xp-op-as": "value for testing"
        },
        "locationField": {
            "en-US": {
                "lat": 19.28563,
                "lon": 72.8691
            }
        }
    }
]

const value = Object.fromEntries(Object.entries(data).map(el=>(el[1]=Object.values(el[1])[0], el)))
    console.log(value);

I am trying to get value from the data json by using the object.fromEntries n object.entries but its not working as my expectation as I am expecting the value as

Expectation

{
  {
    testingNewValue:"hello"
  },
  {
    testingNewValue:"hello"
  },
  {
    testingNewValue:"dummy"
  },
  {
    testingNewValue:"value for testing",
    locationField:{
      lat: 19.28563,
      lon: 72.8691
    }
  }
}

but I am getting "0","1","2" as you can see in code snippet as I want to remove all "en-US","hi-In" n all from data

How can I get my expectation

Your expected result isn't valid, an object {} must have a key for each value. Did you mean to use an array [] for the outer brackets? — Nick Parsons
– Nick Parsons, Commented Feb 6, 2022 at 5:30
Hi @NickParsons I have updated my question I want to remove all en-Us hi-In and get the value as expected — Aakash
– Aakash, Commented Feb 6, 2022 at 5:33

Nick Parsons · Accepted Answer · 2022-02-06 05:39:04Z

1

Provided that you're actually after an array (as your current expected result isn't a valid structure), you should be taking the entires of each inner objects and then taking building your new object with fromEntries() after mapping each entry, rather then taking the entires of your entire data array which is causing the indexes to appear in your current result. The below code assumes you have one value within each inner object, and that each value is an object:

const data = [ { "testingNewValue": { "en-US": "hello" } }, { "testingNewValue": { "hi-IN": "hello " } }, { "testingNewValue": { "us": "dummy" } }, { "testingNewValue": { "xp-op-as": "value for testing" }, "locationField": { "en-US": { "lat": 19.28563, "lon": 72.8691 } } } ];

const value = data.map(el=>
  Object.fromEntries(Object.entries(el).map(([k, v]) => [k, Object.values(v)[0]]))
);
console.log(value);

answered Feb 6, 2022 at 5:39

Nick Parsons

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4 Comments

Aakash Over a year ago

Hi Nick can I get value start with { } instead of square brackets [ ] is this possible? as I was expecting the output in { }

Nick Parsons Over a year ago

@Aakash no, that isn't possible. If you have {} then you have an object, and if you have an object, then you must have key-values within it, such as: {key: value}. Your expected result doesn't have any keys in it, so your expected result isn't valid. If you update your expected result to have unique keys with values, then it is possible

Aakash Over a year ago

ya i got it @Nick but as you can see while running the code snippet my data containing [ ] and after running the wrong code I got { } as I was expecting the same { } that's why I asked 😅

Nick Parsons Over a year ago

@Aakash Your code outputs an object, that's why it's in { }, you can see that it has key-value pairs in it, for example, "0" is a key, and the value is {"en-US": "hello"}, so that's a valid structure, but in your expected result, you don't mention any keys, so it doesn't make sense to store this data in an object { }, so that is why an array [ ] needs to be used. eg: try and store a simplified version of your expected output in a variable by manually writing it const x = {{testingNewValue:"hello"}}, you'll see that you get a SyntaxError as it's not valid to have this structure.

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