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

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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.

navigator google-chrome internationalization javascript
4 Answers

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
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