Check if key exists in JSON object using jQuery

Question

I have done AJAX validation and validated message is returned as a JSON array. Therefore I need to check whether the keys, like name and email, are in that JSON array.

{     "name": {         "isEmpty": "Value is required and can't be empty"     },     "email": {         "isEmpty": "Value is required and can't be empty"     } } 

Only if the key name is present, I need to write an error message to the name field.

Following is the code to display an error if fields is entered

if (obj['name']'isEmpty'] != "") {                                     $('#name').after(c1 + "<label class='error'>" + obj['name']['isEmpty'] + "</label>"); }                                        if (obj['email']['isEmpty'] != "" ) {     $('#email').after(c4 + "<label class='error'>" + obj['email']['isEmpty'] + "</label>"); } 

But if the name field is entered, it will not be in JSON array. So the checking statement

if (obj['name']['isEmpty'] != "") 

will result in the following error:

obj.name not found

It is not necessary to have key name in the array. At same time I need to check for this to display the error if the array possesses the key name.

Answer 1

Use JavaScript's hasOwnProperty() function:

if (json_object.hasOwnProperty('name')) {     //do struff }