Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The Navigator.doNotTrack property returns the user's Do Not Track setting, which indicates whether the user is requesting websites and advertisers to not track them.
The value of the property reflects that of the DNT HTTP header, i.e., values of "1", "0", or null.
The whole DNT (Do Not Track) specification has been discontinued. The mechanism design was flawed, because it was a cooperative feature between users, websites, and browsers. The idea is that the user tells the website to not track them, and the website would comply. However, there is no strict enforcement of this policy, so advertisement websites ignored the DNT header and tracked users anyway. The feature is therefore useless. Moreover, it is harmful as it leaves more user fingerprint in the header, which can be used to track users even more.
Browsers are exploring other more enforceable privacy features, such as global privacy control, restriction to third-party cookies, and more.
ValueA string or null.
console.log(navigator.doNotTrack);
// prints "1" if DNT is enabled; "0" if the user opted-in for tracking; otherwise null
Part of the discontinued Tracking Preference Expression (DNT) specification.
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