JavaScript | Remove a JSON attribute

The task is to remove a JSON attribute from the JSON object. To do so, Here are few of the mostly used techniques discussed.
First delete property need to be discussed.

Delete property
This keyword deletes a property from an object:
- This keyword deletes both the value of the property and the property itself.
- After deletion, the property is not available for use before it is added back again.
- This operator is created to be used on object properties, not on variables or functions.
- This operator should not be used on predefined JavaScript object properties. It can crash your application.
Syntax:
```
delete object.property or
delete object['property']
```
Parameters:
- object: It specifies the name of an object, or an expression evaluating to an object.
- property: .It specifies the property to delete.
Return value:
It returns true for all cases and returns false when the property is an own non-configurable property.

Example 1: This example deletes the prop_12 from the myObj object via var key by using delete property.

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        JavaScript | Remove a JSON attribute. 
    </title> 
</head> 
  
<body style="text-align:center;" id="body"> 
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
    <p id="GFG_UP" 
       style="font-size: 16px; font-weight: bold;"> 
  
    </p> 
    <button onclick="gfg_Run()"> 
        Click here 
    </button> 
    <p id="GFG_DOWN"
       style="color:green; 
              font-size: 20px;  
              font-weight: bold;"> 
    </p> 
    <script> 
        var el_up = document.getElementById("GFG_UP"); 
        var el_down = document.getElementById("GFG_DOWN"); 
        var myObj = { 
            'prop_1': { 
                'prop_11': 'value_11', 
                'prop_12': 'value_12' 
            } 
        }; 
        el_up.innerHTML = JSON.stringify(myObj); 
  
        function gfg_Run() { 
            var key = "prop_12"; 
            delete myObj.prop_1[key]; 
            el_down.innerHTML = JSON.stringify(myObj); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

Example 2: This example deletes the prop_11 from the myObj object by using delete property.

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        JavaScript | 
      Remove a JSON attribute. 
    </title> 
</head> 
  
<body style="text-align:center;" id="body"> 
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
    <p id="GFG_UP" 
       style="font-size: 16px;  
              font-weight: bold;"> 
  
    </p> 
    <button onclick="gfg_Run()"> 
        Click here 
    </button> 
    <p id="GFG_DOWN" 
       style="color:green;  
              font-size: 20px;  
              font-weight: bold;"> 
    </p> 
    <script> 
        var el_up =  
            document.getElementById("GFG_UP"); 
        var el_down =  
            document.getElementById("GFG_DOWN"); 
        var myObj = { 
            'prop_1': { 
                'prop_11': 'value_11', 
                'prop_12': 'value_12' 
            } 
        }; 
        el_up.innerHTML = JSON.stringify(myObj); 
  
        function gfg_Run() { 
            delete myObj.prop_1.prop_11; 
            el_down.innerHTML = JSON.stringify(myObj); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before clicking on the button:
After clicking on the button:

My Personal Notes

Recommended Posts: