Device Memory API - Web APIs 编辑

Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Capabilities of the client devices largely depend on the amount of available RAM. Traditionally, developrs had to use heruistics and either benchmark the device or infer the device capabilities based on other factors like device manufacturer or User Agent strings.

Accessing device memory capacity

There are two ways to acces the approximate amount of RAM device has: via JavaScript API and via Client Hints HTTP header.

JavaScript API

You may query the approximate amount of ram device has by retreiving Navigator.deviceMemory

var ram1 = window.navigator.deviceMemory;
var ram2 = navigator.deviceMemory;

Both of these will return the same result.

Client Hints Header

You also may use Client Hints directive Device-Memory to retreive the same approximate RAM capacity.

Specifications

Specification	Status	Comment
Device Memory 1	Editor's Draft	Initial definition.

Browser compatibility

JavaScript interface

BCD tables only load in the browser

Client Hints extension

BCD tables only load in the browser

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• Navigator.deviceMemory
• Device-Memory header