bcp-47-normalize

Normalize, canonicalize, and format BCP 47 tags.

Contents

• What is this?
• When should I use this?
• Install
• Use
• API
  • bcp47Normalize(tag[, options])
• Types
• Compatibility
• Security
• Related
• Contribute
• License

What is this?

This package takes BCP 47 tags and makes them uniform. It removes unneeded info (en-us -> en) and replaces deprecated, overlong, and otherwise unpreferred values with preferred values (en-bu -> en-MM). It works by applying Unicode CLDR suggestions.

When should I use this?

You can use this package when dealing with user-provided language tags and want to normalize and clean them.

Install

This package is ESM only. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:

npm install bcp-47-normalize

In Deno with esm.sh:

import {bcp47Normalize} from 'https://esm.sh/bcp-47-normalize@2'

In browsers with esm.sh:

<script type="module">
  import {bcp47Normalize} from 'https://esm.sh/bcp-47-normalize@2?bundle'
</script>

Use

import {bcp47Normalize} from 'bcp-47-normalize'

const tags = [
  'de-de-1901',
  'en-gb',
  'en-us',
  'en-bu',
  'hy-arevmda',
  'nld-nl',
  'no-nyn',
  'pt-br',
  'pt-pt',
  'zh-hans-cn'
]

tags.forEach((tag) => console.log('%s -> %s', tag, bcp47Normalize(tag)))

Yields:

de-de-1901 -> de-1901
en-gb -> en-GB
en-us -> en
en-bu -> en-MM
hy-arevmda -> hyw
nld-nl -> nl
no-nyn -> nn
pt-br -> pt
pt-pt -> pt-PT
zh-hans-cn -> zh

API

This package exports the following identifier: bcp47Normalize. There is no default export.

bcp47Normalize(tag[, options])

Normalize the given BCP 47 tag according to Unicode CLDR suggestions.

Parameters

• tag (string) — BCP 47 tag

• options.forgiving (boolean, default: false) — passed to bcp-47 as options.forgiving

• options.warning (Function?, default: undefined) — passed to bcp-47 as options.warning

  One additional warning is given:

  code	reason
  7	Deprecated region CURRENT, expected one of SUGGESTIONS

  This warning is only given if the region cannot be automatically fixed (when regions split into multiple regions).

Returns

Normal, canonical, and pretty BCP 47 tag (string).

Types

This package is fully typed with TypeScript. It exports additional Options and Warning types that model their respective interfaces.

Compatibility

This package is at least compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. It also works in Deno and modern browsers.

Security

This package is safe.

Related

• wooorm/bcp-47 — parse and stringify BCP 47 language tags
• wooorm/bcp-47-match — match BCP 47 language tags with language ranges per RFC 4647
• wooorm/iso-3166 — ISO 3166 codes
• wooorm/iso-639-2 — ISO 639-2 codes
• wooorm/iso-639-3 — ISO 639-3 codes
• wooorm/iso-15924 — ISO 15924 codes
• wooorm/un-m49 — UN M49 codes

Contribute

Yes please! See How to Contribute to Open Source.

License

MIT © Titus Wormer