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I'm using the i18n-js and the react-native-localize to support multiple languages in my React Native application. I create a JSON file for each language and display it with a key depending on the user's language settings. Here is the core file that imports JSON files and configures the i18n. 

import I18n from 'i18n-js';
import * as RNLocalize from 'react-native-localize';

import en from './en.json';
import ja from './ja.json';

const locales = RNLocalize.getLocales();

if (Array.isArray(locales)) {
  I18n.locale = locales[0].languageTag;
}

I18n.fallbacks = true;
I18n.translations = {
  en,
  ja
};

export default I18n;

Since some languages don't use alphabets, I want to be able to change its font size.

Does anyone know how I can make this work?

sflow
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1 Answers1

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Check this post How to set default font family in React Native?
Answer 1 and 2 is the response to your question.
The question is for font family but it's the same for the font-size, you just need to adjust depending of the langage of your user.

CR7
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