Check if Key Value exists in JSON data

Question

I want to know if the key-value pair exists in JSON data while retrieving data. Display "NA" inside div element if not present or else display the value of that key.

HTML:

   <div id="output"></div>

jQuery:

     $.get('http://api.fixer.io/2000-02-03',function(person){
         if(person.hasOwnProperty('rates.BGN'))  {
              $('#output').text(person.rates.BGN);
            }
         else  {
              $('#output').text('NA');
              }
          });

parse json to javascript object then hasOwnProperty will work. var res = JSON.parse(person); — Ashot
– Ashot, Commented Feb 3, 2017 at 18:12
Possible duplicate of Convert JavaScript string in dot notation into an object reference — Heretic Monkey
– Heretic Monkey, Commented Feb 3, 2017 at 18:25

Dexygen · Accepted Answer · 2017-02-03 18:12:44Z

1

First, you need to parse person into JSON.

Secondly you are misusing hasOwnProperty, it cannot be used to drill down into an object more than one level the way you are trying.

Finally hasOwnProperty is just unnecessary -- just test for existence as follows:

 $.get('http://api.fixer.io/2000-02-03',function(person){
     person = JSON.parse(person); 
     if(person.rates.BGN !== undefined)  {
          $('#output').text(person.rates.BGN);
     }
     //etc.

answered Feb 3, 2017 at 18:12

Dexygen

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1 Comment

charlietfl Over a year ago

no need to parse if you use dataType argument or just use $.getJSON

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