Complete list of all different Intl.NumberFormats

Question

I'm looking for a complete list of all the different Intl.NumberFormats.

The Intl.NumberFormat page shows 3 different formats.

ja-JP -> "￥123,457"
de-DE -> 123.456,79 €
en-IN -> 1,23,000

Is this all? Or is there more?

Answer 1

Intl was introduced here https://hacks.mozilla.org/2014/12/introducing-the-javascript-internationalization-api/ with these takeaways:

1. There's no official list, since "The api is best-effort"
2. By default, browsers accepts ALL correctly formatted codes (BCP 47 is mentioned and then finds the best fit
3. You might specify lookup only to disable the best fit algorithm, and then you could get a list of all countries and language codes and that way run through all combinations for a specific browser on a specific OS with a specific list of installed languages but I guess that's not what you want to hear if you're building a web project. But you might want to make use of supportedLocalesOf to have something locally relevant to choose from.
4. Under the hood browsers typically use ICU or similar

tl;dr: So if you send in your best guess at a valid locale, the best fit algorithm will get you something usable!

Valid locale? According to the documentation and my earlier research, the Intl javascript API expects you to format your locale codes according to BCP 47.