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I would like to know how to convert object properties string to integer in javascript. I have a obj, which if has property value is number string convert to number in javascript

var obj={
  ob1: {id: "21", width:"100",height:"100", name: "image1"},
  ob2: {id: "22", width:"300",height:"200", name: "image2"}
}


function convertIntObj (obj){
    Object.keys(obj).map(function(k) { 
            if(parseInt(obj[k])===NaN){
              return obj[k] 
            }
            else{
              return parseInt(obj[k]);
            }
        });
}

var result = convertIntObj(obj);

console.log(result)

I would like to know how to convert object properties string to integer in javascript. I have a obj, which if has property value is number string convert to number in javascript

var obj={
  ob1: {id: "21", width:"100",height:"100", name: "image1"},
  ob2: {id: "22", width:"300",height:"200", name: "image2"}
}


function convertIntObj (obj){
    Object.keys(obj).map(function(k) { 
            if(parseInt(obj[k])===NaN){
              return obj[k] 
            }
            else{
              return parseInt(obj[k]);
            }
        });
}

var result = convertIntObj(obj);

console.log(result)

Expected Output:

[
  {id: 21, width:100,height:100, name: "image1"},
  {id: 22, width:300,height:200, name: "image2"}
]

• javascript
• arrays
• object
• javascript-objects

Share Improve this question Follow edited Apr 6, 2020 at 10:19 VLAZ 29.1k99 gold badges6262 silver badges8484 bronze badges asked Apr 6, 2020 at 10:17 SenSen 77333 gold badges1414 silver badges3535 bronze badges 2

• 1 You don't have any return in convertIntObj, so the value of the function call is implicitly undefined – VLAZ Commented Apr 6, 2020 at 10:20
• 2 ... and NaN is not equal to anything, not even to itself. Also, you need to map the properties of obj individually, currently you're parsing the objects in obj, not their properties. – Teemu Commented Apr 6, 2020 at 10:21

Add a ment  | 

4 Answers 4

Sorted by: Reset to default 10

This should do the work:

var obj = {
  ob1: {
    id: "21",
    width: "100",
    height: "100",
    name: "image1"
  },
  ob2: {
    id: "22",
    width: "300",
    height: "200",
    name: "image2"
  }
}


function convertIntObj(obj) {
  const res = {}
  for (const key in obj) {
    res[key] = {};
    for (const prop in obj[key]) {
      const parsed = parseInt(obj[key][prop], 10);
      res[key][prop] = isNaN(parsed) ? obj[key][prop] : parsed;
    }
  }
  return res;
}

var result = convertIntObj(obj);

console.log('Object result', result)

var arrayResult = Object.values(result);

console.log('Array result', arrayResult)

Click "Run code snippet" so see the result

Iterating over Object.keys() twice. If the value corresponding to the key is a number then parseInt the value else set the default value which was present earlier

var obj = {
  ob1: { id: "21", width: "100", height: "100", name: "image1" },
  ob2: { id: "22", width: "300", height: "200", name: "image2" }
};

var res = {};

Object.keys(obj).forEach(key => {
  res[key] = {};
  Object.keys(obj[key]).forEach(temp => {
    res[key][temp] = !isNaN(obj[key][temp])
      ? parseInt(obj[key][temp], 10)
      : obj[key][temp];
  });
  return res;
});

console.log(res);

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You can use Object.entries() and .reduce() methods to iterate over the key value pairs in your data and use Number and Number.isNaN() methods to transform the values appropriately.

const data = {
  ob1: {id: "21", width:"100",height:"100", name: "image1"},
  ob2: {id: "22", width:"300",height:"200", name: "image2"}
};

const result = Object.entries(data).reduce((r, [k, o]) => {
    r[k] = Object.entries(o).reduce((r, [k, v]) => {
        let _v = Number(v);
        if(!Number.isNaN(_v)) { v = _v; }
        return (r[k] = v, r);
    }, {});
    return r;
}, {});

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Hi I would remend you to use the JSON.stringify() method. It is used to convert object to string which is needed to send data over the web server. It converts the set of variables in the object to a JSON string:

var objToStr = {
  siteName: "W3Docs",
  bookName: "Javascript",
  booksCount: 5
};
var myJSON = JSON.stringify(objToStr);
console.log(myJSON);

Also, you can use the The toString() method. It is also called when you need to convert the object into a string:

var obj = {
  siteName: "W3Docs",
  bookName: "Javascript",
  booksCount: 5
};
function objToString(object) {
  var str = '';
  for (var k in object) {
    if (object.hasOwnProperty(k)) {
      str += k + '::' + object[k] + '\n';

This information is taken from this source.

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