Read or select value names from .json file to push in the array

Question

if myjson.js file data:

{
  "key1": [
    {
      "name1": [
        "word1",
        "word2",
      ],
      "name2": [
        "word3",
        "word4",
      ]
    }
  ]
}

loaded:

  var jsonData = fs.readFileSync("myjson.json", "utf8");
  const data = JSON.parse(jsonData);

  console.log(Object.keys(data));

output:

[ 'key1' ]

or:

 console.log(Object.values(data));

output:

[
  [
    {
      name1: [Array],  
      name2: [Array],  
    }
  ]
]

How properly read or select only value names (without 'value' values - arrays) to create array of value names:

[
   "name1",  
   "name2",  
]

Using `Object.keys` is correct, but you need to select the correct object to get the keys from — Matthew Herbst, Dec 22 '22 at 02:30
Does this answer your question? [Finding all the keys in the array of objects](https://stackoverflow.com/questions/66452572/finding-all-the-keys-in-the-array-of-objects) — pilchard, Dec 22 '22 at 02:32

score 1 · Accepted Answer · answered Dec 22 '22 at 02:30

1

You can use Array#flatMap over each of the arrays of objects.

const data={key1:[{name1:["word1","word2",],name2:["word3","word4",]}]};
let res = Object.values(data).flatMap(x => x.flatMap(Object.keys));
console.log(res);

answered Dec 22 '22 at 02:30

Unmitigated

76,500
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score 1 · Answer 2 · answered Dec 22 '22 at 02:51

1

Note key1 is actually an array.

const obj = {
  "key1": [
    {
      "name1": [
        "word1",
        "word2",
      ],
      "name2": [
        "word3",
        "word4",
      ]
    }
  ]
};

console.log(Object.keys(obj.key1[0]));

answered Dec 22 '22 at 02:51

Ronnie Royston

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Read or select value names from .json file to push in the array

2 Answers2