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JavaScript

var obj = {
    "db": {
        "name": "db",
            "connector": "memory"
    },
        "MySql": {
        "host": "localhost",
            "port": 3306,
            "database": "users",
            "username": "root",
            "password": "",
            "name": "MySql",
            "connector": "mysql"
    },
        "postgreDS": {
        "host": "localhost",
            "port": 1234,
            "database": "abc",
            "username": "postgres",
            "password": "abc",
            "name": "postgreDS",
            "connector": "postgresql"
    }
}

    function getValueFromKey(obj, key) {
        return Object.keys(obj).map(function (el) {
            return obj[el][key];
        });
    }
console.log(getValueFromKey(obj, 'name'));
console.log(getValueFromKey(obj, 'connector'));