How to get all keys with values from nested objects

You can use for...in and create recursive function.

var obj = {"check_id":12345,"check_name":"Name of HTTP check","check_type":"HTTP","tags":["example_tag"],"check_params":{"basic_auth":false,"params":["size",{"a":"b"}],"encryption":{"enabled":true}}}

var keys = []
function getKeys(data, k = '') {
  for (var i in data) {
    var rest = k.length ? '.' + i : i

    if (typeof data[i] == 'object') {
      if (!Array.isArray(data[i])) {
        getKeys(data[i], k + rest)
      }
    } else keys.push(k + rest)
  }
}

getKeys(obj)
console.log(keys)

You could check the keys and iterate otherwise push the path to the result set.

function getKeys(object) {
    function iter(o, p) {
        if (Array.isArray(o)) { return; }
        if (o && typeof o === 'object') {
            var keys = Object.keys(o);
            if (keys.length) {
                keys.forEach(function (k) { iter(o[k], p.concat(k)); });
            }
            return;
        }
        result.push(p.join('.'));
    }
    var result = [];
    iter(object, []);
    return result;
}

var object = { check_id: 12345, check_name: "Name of HTTP check", check_type: "HTTP", tags: ["example_tag"], check_params: { basic_auth: false, params: ["size"], encryption: { enabled: true } } };

console.log(getKeys(object));
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You could use reduce like this:

const keyify = (obj, prefix = '') => 
  Object.keys(obj).reduce((res, el) => {
    if( Array.isArray(obj[el]) ) {
      return res;
    } else if( typeof obj[el] === 'object' && obj[el] !== null ) {
      return [...res, ...keyify(obj[el], prefix + el + '.')];
    }
    return [...res, prefix + el];
  }, []);

const input = {
   "check_id":12345,
   "check_name":"Name of HTTP check",
   "check_type":"HTTP",
   "tags":[
     "example_tag"
   ],
   "check_params":{
      "basic_auth":false,
      "params":[
        "size"
      ],
      "encryption": {
        "enabled": true,
        "testNull": null,
      }
   }
};

const output = keyify(input);

console.log(output);

Edit1: For the general case where you want to include arrays.

const keyify = (obj, prefix = '') => 
  Object.keys(obj).reduce((res, el) => {
    if( typeof obj[el] === 'object' && obj[el] !== null ) {
      return [...res, ...keyify(obj[el], prefix + el + '.')];
    }
    return [...res, prefix + el];
  }, []);

const input = {
   "check_id":12345,
   "check_name":"Name of HTTP check",
   "check_type":"HTTP",
   "tags":[
     "example_tag"
   ],
   "nested": [
      { "foo": 0 },
      { "bar": 1 }
   ],
   "check_params":{
      "basic_auth":false,
      "params":[
        "size"
      ],
      "encryption": {
        "enabled": true,
        "testNull": null,
      }
   }
};

const output = keyify(input);

console.log(output);

A generator makes quick work of this kind of problem -

function* deepKeys (t, pre = [])
{ if (Array.isArray(t))
    return
  else if (Object(t) === t)
    for (const [k, v] of Object.entries(t))
      yield* deepKeys(v, [...pre, k])
  else
    yield pre.join(".")
}

const input =
  {check_id:12345,check_name:"Name of HTTP check",check_type:"HTTP",tags:["example_tag"],check_params:{basic_auth:false,params:["size"],encryption:{enabled:true,testNull:null,}}}
 
console.log(Array.from(deepKeys(input)))
[ "check_id"
, "check_name"
, "check_type"
, "check_params.basic_auth"
, "check_params.encryption.enabled"
, "check_params.encryption.testNull"
]

Or a pure functional expression which eagerly computes all keys -

const deepKeys = (t, pre = []) =>
  Array.isArray(t)
    ? []
: Object(t) === t
   ? Object
      .entries(t)
      .flatMap(([k, v]) => deepKeys(v, [...pre, k]))
: pre.join(".")

const input =
  {check_id:12345,check_name:"Name of HTTP check",check_type:"HTTP",tags:["example_tag"],check_params:{basic_auth:false,params:["size"],encryption:{enabled:true,testNull:null,}}}
 
console.log(deepKeys(input))
[ "check_id"
, "check_name"
, "check_type"
, "check_params.basic_auth"
, "check_params.encryption.enabled"
, "check_params.encryption.testNull"
]

Tags:

Javascript

Arrays

Object

Javascript Objects

Recursion

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