The handler.get() method is a trap for getting a property value.


var p = new Proxy(target, {
  get: function(target, property, receiver) {


The following parameters are passed to the get method. this is bound to the handler.

The target object.
The name of the property to get.
Either the proxy or an object that inherits from the proxy.

Return value

The get method can return any value.


The handler.get method is a trap for getting a property value.


This trap can intercept these operations:

  • Property access: proxy[foo]and proxy.bar
  • Inherited property access: Object.create(proxy)[foo]
  • Reflect.get()


If the following invariants are violated, the proxy will throw a TypeError:

  • The value reported for a property must be the same as the value of the corresponding target object property if the target object property is a non-writable, non-configurable data property.
  • The value reported for a property must be undefined if the corresponding target object property is non-configurable accessor property that has undefined as its [[Get]] attribute.


The following code traps getting a property value.

var p = new Proxy({}, {
  get: function(target, prop, receiver) {
    console.log("called: " + prop);
    return 10;

console.log(p.a); // "called: a"
                  // 10

The following code violates an invariant.

var obj = {};
Object.defineProperty(obj, "a", { 
  configurable: false, 
  enumerable: false, 
  value: 10, 
  writable: false 

var p = new Proxy(obj, {
  get: function(target, prop) {
    return 20;

p.a; // TypeError is thrown


Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of '[[Get]]' in that specification.
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
The definition of '[[Get]]' in that specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support ? 18 (18) ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? 18.0 (18) ? ? ?

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

ECMAScript6 JavaScript Method Proxy