How to format numbers in React app?

When developing a React application that supports multiple languages, it's essential to consider how numbers are formatted in different locales. In some languages, decimal numbers are separated with dots, while in others, commas are used. This can lead to confusion for users if the formatting is not done correctly.

To ensure proper localization of the app, it's important to format numbers correctly. One way to achieve this is by using the built-in Javascript Intl object. This object provides a variety of options for formatting numbers, including currency and percentage formatting.

let number = 123456.789;

let enFormatter = new Intl.NumberFormat('en-US', { style: 'decimal' });
console.log(enFormatter.format(number)); // 123,456.789

let deFormatter = new Intl.NumberFormat('de-DE', { style: 'decimal' });
console.log(deFormatter.format(number)); // 123.456,789

To learn more about formatting numbers using the JavaScript Intl object, you can check out this article. Additionally, if you're interested in formatting numbers with the react-intl library, this article may provide further insights.

React internationalization tutorial:

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