The getHighEntropyValues() method of the NavigatorUAData interface is a Promise that resolves with a dictionary object containing the high entropy values the user-agent returns.

hints

An array containing the hints to be returned, one or more of:

• "architecture"
• "bitness"
• "model"
• "platformVersion"
• "uaFullVersion" Deprecated
• "fullVersionList"

A Promise that resolves to an object containing some or all of the following values (based on the hints requested):

brands

Returns an array of objects containing brand and version specifying the browser brand and its version (the same information as provided by NavigatorUAData.brands). Note that this information can be sent to a server in the Sec-CH-UA header (a low-entropy client hint).

mobile

Returns true if the user agent is running on a mobile device (the same information as provided by NavigatorUAData.mobile). Note that this information can be sent to a server in the Sec-CH-UA-Mobile header (a low-entropy client hint).

platform

Returns a string describing the platform the user agent is running on, like "Windows" (the same information as provided by NavigatorUAData.platform). Note that this information can be sent to a server in the Sec-CH-UA-Platform header (a low-entropy client hint).

architecture

A string containing the platform architecture. For example, "x86". Note that this information can be sent to a server in the Sec-CH-UA-Arch header after the server explicitly requests it in the Accept-CH header.

bitness

A string containing the architecture bitness. For example, "32" or "64". Note that this information can be sent to a server in the Sec-CH-UA-Bitness header if the server explicitly requests it in the Accept-CH header.

model

A string containing the model of mobile device. For example, "Pixel 2XL". If device is not a mobile device or if device model is not known, model will be "". Note that this information can be sent to a server in the Sec-CH-UA-Model header if the server explicitly requests it in the Accept-CH header.

platformVersion

A string containing the platform version. Platform name itself is always available as low-entropy hint platform. For example, "10.0". Note that this information can be sent to a server in the Sec-CH-UA-Platform-Version header if the server explicitly requests it in the Accept-CH header.

uaFullVersion Deprecated

A string containing the full browser version. For example, "103.0.5060.134". Deprecated in favor of fullVersionList. Note that this information can be sent to a server in the Sec-CH-UA-Full-Version header if the server explicitly requests it in the Accept-CH header.

fullVersionList

An array of objects with properties "brand" and "version" representing the browser name and full version respectively. For example, {"brand": "Google Chrome", "version": "103.0.5060.134"}, {"brand": "Chromium", "version": "103.0.5060.134"}. Please note that one object may intentionally contain invalid information to prevent sites from relying on a fixed list of browsers. Note that this information can be sent to a server in the Sec-CH-UA-Full-Version-List header if the server explicitly requests it in the Accept-CH header.

NotAllowedError DOMException

Thrown if the user-agent decides that one or more of the hints requested should not be returned.

In the following example a number of hints are requested using the getHighEntropyValues() method. When the promise resolves, this information is printed to the console.

navigator.userAgentData
  .getHighEntropyValues([
    "architecture",
    "model",
    "platformVersion",
    "fullVersionList",
  ])
  .then((values) => console.log(values));

• These values are also available as via HTTP request headers:
  • Low-entropy client hints) are sent automatically:
    • Sec-CH-UA
    • Sec-CH-UA-Mobile
    • Sec-CH-UA-Platform
  • Servers can request to receive high-entropy client hints on subsequent requests, using the Accept-CH header:
    • Sec-CH-UA-Arch
    • Sec-CH-UA-Bitness
    • Sec-CH-UA-Full-Version
    • Sec-CH-UA-Model
    • Sec-CH-UA-Platform-Version