JavaScript Number.toLocaleString() with 4 digits after separator

You may use second argument to provide some options. In your case, with default locale:

number.toLocaleString(undefined, { minimumFractionDigits: 4 })

I found that

var number = 49.9712;
number.toLocaleString( { minimumFractionDigits: 4 })

gave the result of "49.971"

In order to actually get the 4 decimal place digits, I did this:

number.toLocaleString(undefined, { minimumFractionDigits: 4 })

Also filling in a country code worked:

number.toLocaleString('en-US', { minimumFractionDigits: 4 })

In both cases I got 49.9712 for the answer.

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