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


const 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 or Symbol  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 own data property.
  • The value reported for a property must be undefined if the corresponding target object property is a non-configurable own accessor property that has undefined as its [[Get]] attribute.


Trap for getting a property value

The following code traps getting a property value.

const p = new Proxy({}, {
  get: function(target, property, receiver) {
    console.log('called: ' + property);
    return 10;

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

The following code violates an invariant.

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

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

p.a; // TypeError is thrown


ECMAScript (ECMA-262)
The definition of '[[Get]]' in that specification.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
getChrome Full support 49Edge Full support 12Firefox Full support 18IE No support NoOpera Full support 36Safari Full support 10WebView Android Full support 49Chrome Android Full support 49Firefox Android Full support 18Opera Android Full support 36Safari iOS Full support 10Samsung Internet Android Full support 5.0nodejs Full support 6.0.0


Full support  
Full support
No support  
No support

See also