1const money = 10000;
2
3new Intl.NumberFormat('jp-JP', {
4  style: 'currency',
5  currency: 'JPY',
6}).format(money); // 'JP¥ 10,000'
7
8new Intl.NumberFormat('de-DE', {
9  style: 'currency',
10  currency: 'EUR',
11}).format(money); // '€ 10,000.00'

Guide for the parameter

Let's talk about the parameters. It's made up of the locales and the options object.

1new Intl.NumberFormat([locales[, options]])

Parameter: Locales

First, you have the locales, this is the language and region settings. It is made up of language code and the country code.

1language code + country code
2
3//ex-1
4en-CA
5en = English (language)
6CA = Canada (country)
7
8//ex-2
9de-DE
10de = German (language)
11DE = Germany (country)
12

list of the Language code

list of the Country code

Parameter: Options

There are tons of options, but let's just talk about the two that we're using: styles, and currency.

Options: Style

The style is the easy part. This is the style for your number formatting. Since this is a currency blog, our choice would be currency. The 3 possible values are:

decimal (plain number formatting, the default)
currency (currency formatting, what we're using)
percent (percent formatting)

1const money = 100;
2
3new Intl.NumberFormat('en-CAD', { currency: 'CAD'
4  style: 'decimal',
5}).format(money); // '100'
6
7new Intl.NumberFormat('en-CAD', { currency: 'CAD'
8  style: 'currency',
9}).format(money); // 'CA$ 100.00'
10
11new Intl.NumberFormat('en-CAD', { currency: 'CAD'
12  style: 'percent',
13}).format(money); // '10,000%'

Options: Currency

Obviously, there are tons of currency options. You can see the full list here

Here are some examples:

CAD (Canadian dollar)
USD (US dollar)
EUR (Euro)
CNY (Chinese RMB)

Resources

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Currency formatting on JavaScript ES6