Last Updated : 12 Jul, 2025
The Object.defineProperty() method in JavaScript is a Standard built-in object which defines a new property directly on an object or it can also modify the existing property of an object and return the object.
Syntax:Object.defineProperty(obj, prop, descriptor)Parameters:
This method accepts three parameters as mentioned above and described below:
Example 1: In this example, we will add new properties to an object and print it in the console using the Object.defineProperty() method in JavaScript.
javascript
const geek1 = {};
Object.defineProperty(geek1, 'prop1', {
value: 65,
writable: false
});
geek1.prop1 = 7;
console.log(geek1.prop1);
const geek2 = {};
Object.defineProperty(geek2, 'prop2', {
value: 54,
value: 23,
value: 12 * 9,
});
geek2.prop2;
console.log(geek2.prop2);
Output:
65
108
Example 2: In this example, we will add new properties to an object and print it in the console using the Object.defineProperty() method in JavaScript.
javascript
function gfg() {
}
let result;
Object.defineProperty(gfg.prototype, "valx", {
get() {
return result;
},
set(valx) {
result = valx;
}
});
let vala = new gfg();
let valb = new gfg();
vala.valx = 6;
console.log(valb.valx);
function gfg1() {
}
gfg1.prototype.valx = 4;
Object.defineProperty(gfg1.prototype, "valy", {
writable: false,
value: 8
});
let vala = new gfg1();
vala.valx = 4;
console.log(vala.valx);
console.log(gfg1.prototype.valx);
vala.valy = 2;
console.log(vala.valy);
console.log(gfg1.prototype.valy);
Output:
6
4
4
8
8
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.defineProperty() method are listed below:
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4