CODE EXAMPLE FOR JAVASCRIPT

responsive font size react native

import { Dimensions, Platform, PixelRatio } from 'react-native';

const {
  width,
  height,
} = Dimensions.get('window');

export function normalize(size, multiplier = 2) {
  const scale = (width / height) * multiplier;

  const newSize = size * scale;

  return Math.round(PixelRatio.roundToNearestPixel(newSize));
}