Node JS - how to detect user language

Question

I'm trying to check user language in pure node js, without any extensions from npm. I used process and global command, there is a lot of specifications but i couldn't find system language

Answer 1

Here is an OS/node/browser independent way of obtaining the default locale

let locale = Intl.DateTimeFormat().resolvedOptions().locale;
console.log(locale);

Answer 2

Answer is in your question. You don't want to use a plugin, but you can take a look on how they do it :)

The answer is the environment

Spoiler

function getEnvLocale(env) {
    env = env || process.env;

    return env.LC_ALL || env.LC_MESSAGES || env.LANG || env.LANGUAGE;
}

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Don't forget to adapt to the different platform (mac, linux, windows...)