How to change Chrome settings to test using navigator.language?

Question

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?

Clarification

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

Answer 1

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

More information: https://alicoding.com/detect-browser-language-preference-in-firefox-and-chrome-using-javascript/

Answer 2

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 com.google.Chrome AppleLanguages '(es, es-ES)'

To verify:

defaults read com.google.Chrome

This is the situation as of Chrome build 58.0.3029.110.

Answer 3

As of Sept 2021, on Mac (M1):

To change window.navigator.language:

1. Settings > Advanced > Language > Add Language
2. then bring this language to the top

To change the language of the user interface:

(thanks to @AdamBittlingmayer above)

defaults write com.google.Chrome AppleLanguages '(es, es-ES)'

To verify:

defaults read com.google.Chrome

Answer 4

With Sensors on Google Chrome as shown below, you can test how navigator.language behaves in other locales. *You can see my answer explaining Sensors in detail.