def jscFlavor = 'org.webkit:android-jsc-intl:+'
Clean build and react-native run android
This variant is about 6MiB larger per architecture than default.
So, expect your APK size to increase by about 4MB for each APK architecture build if using def enableSeparateBuildPerCPUArchitecture = true
and a more bigger APK if separate build per architecture is disabled
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–
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This is an issue with Javascript core used to run react native in Android and not with react native itself. To overcome this, you'll have to integrate latest javascript core into your android build or upgrade react native to 0.59.
The details are documented in JSC Android Buildscripts repo.
Now for people who would like to do the locale string formatting without needing to integrate the entire javascript core, Javascript has Internationalization API which lets you format numbers to language sensitive format. Documentation available at MDN
This API is not available in android and needs to be polyfilled using Intl
In your project root, install the Intl library
yarn add intl
And then in your project's index file (index.js) add the following code at the top of the file:
if(Platform.OS === 'android') { // only android needs polyfill
require('intl'); // import intl object
require('intl/locale-data/jsonp/en-IN'); // load the required locale details
After doing the above two steps, you can now get locale string anywhere in your project using
new Intl.NumberFormat('en-IN', { style: 'currency', currency: 'INR' }).format(10000000);
In case you need to format number for another locale code, all the locale code details are available under the intl/locale-data/jsonp/
directory. Simply require the ones you need in your index.js file.
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The reason for this is very old version of JavaScriptCore used by react-native. iOS embeds own version which is why it is working fine there.
Issue still exists (some reading about where it's heading https://github.com/facebook/react-native/issues/19737)
And more info about this from Airbnb devs
https://medium.com/airbnb-engineering/react-native-at-airbnb-the-technology-dafd0b43838 (search for "JavaScriptCore inconsistencies")
(value) => {
if (typeof value === 'number') {
const [currency, cents] = (value / 100).toFixed(2).toString().split('.');
return `${currency.replace(/\B(?=(\d{3})+(?!\d))/g, '.')},${cents}`;
return '0,00';
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yarn add @formatjs/intl-getcanonicallocales @formatjs/intl-locale @formatjs/intl-pluralrules @formatjs/intl-numberformat
Check if need polyfill
import {shouldPolyfill} from '@formatjs/intl-numberformat/should-polyfill'
if (shouldPolyfill()) {
require('@formatjs/intl-getcanonicallocales/polyfill');
require('@formatjs/intl-locale/polyfill');
require('@formatjs/intl-pluralrules/polyfill');
require('@formatjs/intl-numberformat/polyfill');
require('@formatjs/intl-numberformat/locale-data/en-US');
see source: https://formatjs.io/docs/polyfills/intl-numberformat/
A very easy and straight forward way is to use a polyfill:
First it needs to be installed:
npm i number-to-locale-string-polyfill
This has to be added in your code, best just outside the class/function where you want to use .toLocaleString().
require('number-to-locale-string-polyfill');
I solved this using a custom function
function numberToMoney(amount, simbol = '$', decimalCount = 2, decimal
= ".", thousands = ",") {
decimalCount = Math.abs(decimalCount)
decimalCount = isNaN(decimalCount) ? 2 : decimalCount
const negativeSign = amount < 0 ? "-" : ""
const i = parseInt(amount = Math.abs(Number(amount) ||
0).toFixed(decimalCount)).toString()
const j = (i.length > 3) ? i.length % 3 : 0
return simbol + negativeSign + (j ? i.substr(0, j) + thousands : '') +
i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thousands) + (decimalCount ?
decimal + Math.abs(amount - i).toFixed(decimalCount).slice(2) : "")
No need to install extra packages
Displaying currency values in React Native
A zero dependencies solution:
const parseCurr = (value) =>
Platform.OS === 'android'
? '$' + price.toFixed(2)
: price.toLocaleString('en-US', { style: 'currency', currency:'USD' });
parseCurr(25.75) // => $25.75
A real life example (money values are multiplied by 100 for better cents precision) and converting the value to Brazilian Reais (R$)
export const getBRPrice = (price: number) => {
const parsedPrice =
( price / 100 ).toLocaleString('pt-BR', { style: 'currency', currency: 'BRL' });
return Platform.OS === 'android'
? `R$${ ( price / 100 ).toFixed(2) }`
: parsedPrice;
// getBRPrice(450) => R$4,50
Solution: 1
Go to your android/app/build.gradle
Replace this line def jscFlavor = 'org.webkit:android-jsc:+'
with this
def jscFlavor = 'org.webkit:android-jsc-intl:+'
Stop the metro and rebuild your app.
Solution: 2
Otherwise, you can use this package https://www.npmjs.com/package/luxon
import import {DateTime} from 'luxon';
const date = DateTime.fromISO(new Date().toISOString());
const formatted = date.toLocaleString(DateTime.DATETIME_MED);
console.log(formatted);
Merging some responses from this thread, you can use this code where it is possible to customize the formatted response
const defaultOptions = {
significantDigits: 2,
thousandsSeparator: ',',
decimalSeparator: '.',
symbol: '$'
const currencyFormatter = (value, options) => {
if (typeof value !== 'number') value = 0.0
options = { ...defaultOptions, ...options }
value = value.toFixed(options.significantDigits)
const [currency, decimal] = value.split('.')
return `${options.symbol} ${currency.replace(
/\B(?=(\d{3})+(?!\d))/g,
options.thousandsSeparator
)}${options.decimalSeparator}${decimal}`
function numberWithCommas(x) {
return x.toString().replace(/\B(?<!\.\d*)(?=(\d{3})+(?!\d))/g, ",");
This will remove commas after decimal point
If you need two digits after the decimal and always want to round down
you can use below code.
Math.floor(1233.31231231 * 100) / 100).toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",")
To round differently check out this resource
If these solutions don't work for you... In my case, I was using React Native with the expo web simulator and wanted to format minutes with 2 characters ie. 00, 01, ... 10, 11, etc. My solution was to check if minutes contained one character, if so, prepend a "0".
... + (date.getMinutes().toString().length == 1 ? "0" : "") + date.getMinutes().toString()
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