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JavaScript | Remove a JSON attribute

JavaScript | Remove a JSON attribute

Last Updated : 11 Aug, 2023

In this article, we will see how to remove a JSON attribute from the JSON object. To do this, there are few of the mostly used techniques discussed. First delete property needs to be discussed.

Delete property to Remove a JSON Attribute

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 variable key by using delete property.

JavaScript

let myObj = {
    'prop_1': {
        'prop_11': 'value_11',
        'prop_12': 'value_12'
    }
};

function removeJsonAttr() {
    let key = "prop_12";
    delete myObj.prop_1[key];
    
    console.log(JSON.stringify(myObj));
}

removeJsonAttr();

Output

{"prop_1":{"prop_11":"value_11"}}

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

JavaScript

let myObj = {
    'prop_1': {
        'prop_11': 'value_11',
        'prop_12': 'value_12'
    }
};

function removeJsonAttr() {
    delete myObj.prop_1.prop_11;
    
    console.log(JSON.stringify(myObj));
}

removeJsonAttr();

Output

{"prop_1":{"prop_12":"value_12"}}

JavaScript | Remove a JSON attribute

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PranchalKatiyar

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