Extract all json key from unknown json structure

Question

I'm a problem with an algorithm, I want know all key(nested object, array of object) from some json (unknown structures) file in one array.

{
  "key": "value to array",
  "key": [{
    "key": {
     "key": "value"
     "key": ["value", "value", "value", {"key":"value"}]
    }
  }]
}

The structure can change.

Function(object) {
  var array_of_all_key = []
  return array_of_all_key
}

function allKeys(object) {
  Object.keys(object).reduce((keys, key) => {

 if(typeof object[key] == 'object') {
   allKeys(object[key])
 }

 if(tags[key founded on json]) {
   // my global var
   tags[key] = tags[key] + 1
 }

  });
}

score 0 · Answer 1 · answered Jun 23 '16 at 19:26

0

Use Object.keys

var obj = {
  key1: 'foo',
  key2: 'bar'
};
var keys = Object.keys(obj);
//keys === ['key1', 'key2'];

answered Jun 23 '16 at 19:26

zzzzBov

174,988
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Yes but I don't know the structures of json – Michael Davies Jun 23 '16 at 19:27
@MichaelDavies, and how does that matter at all? – zzzzBov Jun 23 '16 at 19:27
This isn't fully functional as it won't get nested keys. – Brant Jun 23 '16 at 19:28

score 0 · Answer 2 · answered Jun 23 '16 at 19:26

0

Just use Object.keys and recursive functions.

function allKeys(object) {
  return Object.keys(object).reduce((keys, key) => 
    keys.concat(key, 
      typeof object[key] === 'object' ? allKeys(object[key]) : []
    ), 
    []
  );
}

answered Jun 23 '16 at 19:26

Louay Alakkad

7,132
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How I push to var array = []? – Michael Davies Jun 23 '16 at 19:35
that's what `concat` does – Louay Alakkad Jun 23 '16 at 19:36
Don't work I'm update the question last code – Michael Davies Jun 23 '16 at 19:57
If object is a normal array? – Michael Davies Jun 23 '16 at 19:59
it should work with arrays as well, but you'll get things like `0, 1, 2` etc... – Louay Alakkad Jun 23 '16 at 20:26

Extract all json key from unknown json structure

2 Answers2

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