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+---
+title: Proxy handler
+slug: Web/JavaScript/Reference/Global_Objects/Proxy/handler
+tags:
+  - ECMAScript 2015
+  - JavaScript
+  - Proxy
+translation_of: Web/JavaScript/Reference/Global_Objects/Proxy/Proxy
+---
+<div>{{JSRef}}</div>
+
+<p>The proxy's handler object is a placeholder object which contains traps for {{jsxref("Proxy", "proxies", "", 1)}}.</p>
+
+<h2 id="Methods">Methods</h2>
+
+<p>All traps are optional. If a trap has not been defined, the default behavior is to forward the operation to the target.</p>
+
+<dl>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/getPrototypeOf", "handler.getPrototypeOf()")}}</dt>
+ <dd>A trap for {{jsxref("Object.getPrototypeOf")}}.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/setPrototypeOf", "handler.setPrototypeOf()")}}</dt>
+ <dd>A trap for {{jsxref("Object.setPrototypeOf")}}.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/isExtensible", "handler.isExtensible()")}}</dt>
+ <dd>A trap for {{jsxref("Object.isExtensible")}}.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/preventExtensions", "handler.preventExtensions()")}}</dt>
+ <dd>A trap for {{jsxref("Object.preventExtensions")}}.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/getOwnPropertyDescriptor", "handler.getOwnPropertyDescriptor()")}}</dt>
+ <dd>A trap for {{jsxref("Object.getOwnPropertyDescriptor")}}.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/defineProperty", "handler.defineProperty()")}}</dt>
+ <dd>A trap for {{jsxref("Object.defineProperty")}}.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/has", "handler.has()")}}</dt>
+ <dd>A trap for the {{jsxref("Operators/in", "in")}} operator.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/get", "handler.get()")}}</dt>
+ <dd>A trap for getting property values.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/set", "handler.set()")}}</dt>
+ <dd>A trap for setting property values.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/deleteProperty", "handler.deleteProperty()")}}</dt>
+ <dd>A trap for the {{jsxref("Operators/delete", "delete")}} operator.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/ownKeys", "handler.ownKeys()")}}</dt>
+ <dd>A trap for {{jsxref("Object.getOwnPropertyNames")}} and {{jsxref("Object.getOwnPropertySymbols")}}.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/apply", "handler.apply()")}}</dt>
+ <dd>A trap for a function call.</dd>
+ <dt>{{jsxref("Global_Objects/Proxy/handler/construct", "handler.construct()")}}</dt>
+ <dd>A trap for the {{jsxref("Operators/new", "new")}} operator.</dd>
+</dl>
+
+<p>Some non-standard traps are <a href="/en-US/docs/Web/JavaScript/Reference/Deprecated_and_obsolete_features#Proxy">obsolete and have been removed</a>.</p>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-proxy-object-internal-methods-and-internal-slots', 'Proxy Object Internal Methods and Internal Slots')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-proxy-object-internal-methods-and-internal-slots', 'Proxy Object Internal Methods and Internal Slots')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td>The <code>enumerate</code> handler has been removed.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Proxy.handler")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Proxy")}}</li>
+</ul>