Print object key/values in a csv format

I’m trying to print a object in comma seperated strings format. but I’m unable to understand how to concat keys for objects. Here is an example.

let obj = {
  "name": "Family",
  "count": 6,
  "Children": {
    "name": "Jim",
    "age": "24",
    "address": {
      "street": "5th ave",
      "state": "NY",
      "country":"US"
    }
  },
  "parents": {
    "name": "John",
    "age": "45",
    "address": {
      "street": "New brew st",
      "state": "CA",
      "country":null
    }
  }
};

let data = '';
let tempKey = '';

function printValues(obj) {
  for (var key in obj) {
    if (typeof obj[key] === "object") {
       printValues(obj[key]);
    } else {
      data += key + ' - ' + obj[key] + ',';
    }
    tempKey = '';
  }
  return data;
} 
console.log(printValues(obj));

Here my target is to get the output below format.

"name – Family,count – 6,Children_name – Jim,Children_age –
24,Children_address_street – 5th ave,Children_address_state –
NY,Children_address_country – US,parents_name – John,parents_age –
45,parents_address_street – New brew st,parents_address_state –
CA,parents_address_country – null"

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my current output is

"name – Family,count – 6,name – Jim,age – 24,street – 5th ave,state –
NY,country – US,name – John,age – 45,street – New brew st,state – CA,"

I’m a bit confused about how to do this.

>Solution :

You should keep track of the parent property name on your recursive calls so that you’ll append that prefix if any was passed.

Here I added that argument to your function and I use it to compose the key string used when you "serialize" your object.

I used template literals to make string composition:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals

let obj = {
  "name": "Family",
  "count": 6,
  "Children": {
    "name": "Jim",
    "age": "24",
    "address": {
      "street": "5th ave",
      "state": "NY",
      "country":"US"
    }
  },
  "parents": {
    "name": "John",
    "age": "45",
    "address": {
      "street": "New brew st",
      "state": "CA",
      "country":null
    }
  }
};

let data = '';
let tempKey = '';

function printValues(obj, parent = '') {
  for (var key in obj) {
    if (typeof obj[key] === "object") {
       printValues(obj[key], `${parent}${key}_`);
    } else {
      data += `${parent}${key}` + ' - ' + obj[key] + ',';
    }
    tempKey = '';
  }
  return data;
} 
console.log(printValues(obj));