JavaScript Object getOwnPropertyDescriptor() Method

The Object.getOwnPropertyDescriptor() method in JavaScript is a standard built-in object that enables the full information on a property to be accessed and returns a property descriptor for the own property of a given object. 

Syntax:

Object.getOwnPropertyDescriptor( obj, prop )

Parameters: This method accepts two parameters as mentioned above and described below: 

• obj: This parameter holds the object in which the property is to be looked.
• prop: This parameter holds the name or Symbol of the property whose description is to be retrieved.

Return value: This method returns a property descriptor of the given property or undefined depending upon the existence of the object.

Below examples illustrate the Object.getOwnPropertyDescriptor() method in JavaScript:

Example 1: In this example, we will check if an object contains some property or not using the Object.getOwnPropertyDescriptor() method in JavaScript.

javascript

const geeks1 = {
    prop1: "GeeksforGeeks"
}
const geeks2 = {
    prop2: "Best Platform"
}
const geeks3 = {
    prop3: "And Computer science portal"
}
const descriptor1 = Object.getOwnPropertyDescriptor(geeks1, 'prop1');
const descriptor2 = Object.getOwnPropertyDescriptor(geeks2, 'prop2');
const descriptor3 = Object.getOwnPropertyDescriptor(geeks3, 'prop3');
console.log(descriptor1.enumerable);
console.log(descriptor2.enumerable);
console.log(descriptor1.value);
console.log(descriptor2.value);
console.log(descriptor3.enumerable);
console.log(descriptor3.value);

Output:

true
true
"GeeksforGeeks"
"Best Platform"
true
"And Computer science portal"

Example 2: In this example, we will check if an object contains some property or not using the Object.getOwnPropertyDescriptor() method in JavaScript.

javascript

let geek, result;
geek = { get foo() { return 17; } };
d = Object.getOwnPropertyDescriptor(geek, 'foo');
console.log(d)

geek = { bar: 42 };
d = Object.getOwnPropertyDescriptor(geek, 'bar');
console.log(d)

geek = { [Symbol.for('baz')]: 73 }
d = Object.getOwnPropertyDescriptor(geek, Symbol.for('baz'));
console.log(d)

geek = {};
Object.defineProperty(geek, 'qux', {
    value: 8675309,
    writable: false,
    enumerable: false
});
d = Object.getOwnPropertyDescriptor(geek, 'qux');
console.log(d)

Output:

Object { get: get foo() { return 17; }, set: undefined, enumerable: true, configurable: true }
Object { value: 42, writable: true, enumerable: true, configurable: true }
Object { value: 73, writable: true, enumerable: true, configurable: true }
Object { value: 8675309, writable: false, enumerable: false, configurable: false }

We have a complete list of Javascript Object methods, to check those please go through this JavaScript Object Complete Reference article.

Supported Browsers: The browsers supported by Object.getOwnPropertyDescriptor() method are listed below: 

• Google Chrome 5.0 and above
• Internet Explorer 9.0 and above
• Mozilla 4.0 and above
• Opera 12 and above
• Safari 5.0 and above