How can I change Chrome settings to test using navigator.language

I'm trying to internationalize an app and need to test how it behaves in other locales.

However, navigator.language always returns en-US, even if I change language settings in both Chrome and OS X.

What can I do to the browser to force navigator.language to return something like es-MX?


I'm trying to make the change as a user, through the GUI, not with code.



On MacOS, the Chrome UI language (window.navigator.language) cannot be set via chrome://settings/languages or even via the --lang command line argument (like on Windows) or environment variables (like on Linux).

The browser accept languages (window.navigator.languages array, note the final s) can be set via chrome://settings/languages and thus via ChromeDriver options.

Therefore, besides manually changing the system language for the OS user, the only option remaining is the -AppleLanguages flag.

For example, to Spanish:

defaults write AppleLanguages '(es, es-ES)'

To verify:

defaults read

This is the situation as of Chrome build 58.0.3029.110.


Use chrome://settings/languages#lang and (important) make sure that the language you selected is the top choice (the preferred language).

More information:


In the meantime, there is a generic description how to test locales in Chrome:


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