Fetch API

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2017.

* Some parts of this feature may have varying levels of support.

Note: This feature is available in Web Workers.

The Fetch API provides an interface for fetching resources (including across the network). It is a more powerful and flexible replacement for XMLHttpRequest.

Concepts and usage

The Fetch API uses Request and Response objects (and other things involved with network requests), as well as related concepts such as CORS and the HTTP Origin header semantics.

For making a request and fetching a resource, use the fetch() method. It is a global method in both Window and Worker contexts. This makes it available in pretty much any context you might want to fetch resources in.

The fetch() method takes one mandatory argument, the path to the resource you want to fetch. It returns a Promise that resolves to the Response to that request — as soon as the server responds with headers — even if the server response is an HTTP error status. You can also optionally pass in an init options object as the second argument (see Request).

Once a Response is retrieved, there are a number of methods available to define what the body content is and how it should be handled.

You can create a request and response directly using the Request() and Response() constructors, but it's uncommon to do this directly. Instead, these are more likely to be created as results of other API actions (for example, FetchEvent.respondWith() from service workers).

Find out more about using the Fetch API features in Using Fetch.

Fetch Interfaces

Window.fetch() and WorkerGlobalScope.fetch()

The fetch() method used to fetch a resource.

Headers

Represents response/request headers, allowing you to query them and take different actions depending on the results.

Request

Represents a resource request.

Response

Represents the response to a request.

Specifications

Specification
Fetch
# fetch-method

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
fetch
Authorization header removed from cross-origin redirects
Support for blob: and data:
Send ReadableStream in body
Experimental
init.attributionReporting parameter
Experimental
init.browsingTopics parameter
ExperimentalNon-standard
init.duplex parameter
Experimental
init.keepalive parameter
init.priority parameter
init.referrerPolicy parameter
init.signal parameter

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.
Non-standard. Check cross-browser support before using.
See implementation notes.
Has more compatibility info.

See also