Extract All Json Key From Unknown Json Structure

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': [{

Solution 1:

Use Object.keys

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

Solution 2:

Just use Object.keys and recursive functions.

functionallKeys(object) {
  returnObject.keys(object).reduce((keys, key) => 
    keys.concat(key, 
      typeofobject[key] === 'object' ? allKeys(object[key]) : []
    ), 
    []
  );
}