Web/API/XMLHTTPRequest/timeout

The XMLHttpRequest.timeout property is an unsigned long representing the number of milliseconds a request can take before automatically being terminated. The default value is 0, which means there is no timeout. Timeout shouldn't be used for synchronous XMLHttpRequests requests used in a document environment or it will throw an InvalidAccessError exception. When a timeout happens, a timeout event is fired.

Note: You may not use a timeout for synchronous requests with an owning window.

Using a timeout with an asynchronous request

In Internet Explorer, the timeout property may be set only after calling the open() method and before calling the send() method.

Example

var xhr = new XMLHttpRequest();
xhr.open('GET', '/server', true);

xhr.timeout = 2000; // time in milliseconds

xhr.onload = function () {
  // Request finished. Do processing here.
};

xhr.ontimeout = function (e) {
  // XMLHttpRequest timed out. Do something here.
};

xhr.send(null);

Specifications

Specification	Status	Comment
XMLHttpRequest	Living Standard	WHATWG living standard

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`timeout`	Chrome Full support 29	Edge Full support 12	Firefox Full support 12	IE Full support 8	Opera Full support 17 Full support 17 No support 12 — 16	Safari Full support 6.1	WebView Android Full support ≤37	Chrome Android Full support 29	Firefox Android Full support 14	Opera Android Full support 18 Full support 18 No support 12 — 16	Safari iOS Full support 7	Samsung Internet Android Full support 2.0

Legend

Full support: Full support

XMLHttpRequest.timeout by Mozilla Contributors is licensed under CC-BY-SA 2.5.