Is given string a language code (as per IANA)
npm install is-language-codeIs given string a language code (as per IANA)
This package is pure ESM. If you're not ready yet, install an older version of this program, 3.1.0 (npm i is-language-code@3.1.0).
``bash`
npm i is-language-code
`js
import { strict as assert } from "assert";
import { isLangCode } from "is-language-code";
assert.deepEqual(isLangCode("de-419-DE"), {
res: false,
message: 'Two region subtags, "419" and "de".',
});
assert.deepEqual(isLangCode("sr-Latn"), {
res: true,
message: null,
});
``
Please visit codsen.com for a full description of the API. If you’re looking for the Changelog, it’s here. Also, try the GUI playground.
To report bugs or request features or assistance, raise an issue on GitHub.
MIT License
Copyright © 2010-2025 Roy Revelt and other contributors
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