WorkerNavigator: deviceMemory property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

See full compatibility

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

Note: This feature is only available in Web Workers.

The deviceMemory read-only property of the WorkerNavigator interface returns the approximate amount of device memory in gigabytes.

The reported value is imprecise to curtail fingerprinting. It's approximated by rounding the actual value to the nearest power of 2, then dividing that number by 1024. It is then clamped within lower and upper bounds to protect the privacy of owners of very low-memory or high-memory devices. These bounds may change over time (see browser compatibility table).

Value

A floating point number coarsened to a power of two value, clamped to implement-defined limits.

For example, if a browser does not report below 2 or above 32 then the value is one of: 2, 4, 8, 16, 32.

Examples

The following code can be run in a worker:

const memory = navigator.deviceMemory;
console.log(`This device has approximately ${memory}GiB of RAM.`);

Specifications

Specification
Device Memory API # sec-device-memory-js-api

Browser compatibility

	desktop					mobile							server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Deno
`deviceMemory`	Chrome – Full support Chrome 65 (Release date: 2018-03-06) footnote footnote From Chrome 147, reported values are 2, 4, 8, 16, and 32. footnote Before Chrome 147, reported values are 0.25, 0.5, 1, 2, 4, and 8.	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote footnote From Edge 147, reported values are 2, 4, 8, 16, and 32. footnote Before Edge 147, reported values are 0.25, 0.5, 1, 2, 4, and 8.	Firefox – No support Firefox footnote No support	Opera – Full support Opera 52 (Release date: 2018-03-22) footnote footnote From Opera 131, reported values are 2, 4, 8, 16, and 32. footnote Before Opera 131, reported values are 0.25, 0.5, 1, 2, 4, and 8.	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 65 (Release date: 2018-03-06) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 47 (Release date: 2018-07-23) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 9 (Release date: 2018-09-15) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView Android – Full support WebView Android 65 (Release date: 2018-03-06) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support

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Full support: Full support
No support: No support
: See implementation notes.

WorkerNavigator: deviceMemory property

Value

Examples

Specifications

Browser compatibility

Legend

See also