Get key from "DuplicateKeyError" MongoDB - NodeJS

create-user.js

try {
    await db.collection('users').create({
        name,
        email,
        phone,
        password
    })
} catch (error) {
    if (error.code == 11000) {
        const duplicated = error.match(/index:\s([a-z]+)/i);
        console.log('The ' + duplicated + ' is already used ');
    }
}