Node Mysql query with incremental variable

I have problem why my variable in query dont increment? My code:

function processMessage(event) {
    if (!event.message.is_echo) {
        let message = event.message;
        let senderId = event.sender.id;

    console.log("Received message from senderId: " + senderId);
    console.log("Message is: " + message);
    console.log();
    var user = {
        user_name: '',
        question_index: 0,
    }


    if (message.quick_reply.payload === 'Pass') {
        connection.query("SELECT text FROM quiz_questions WHERE quiz_id = ?", [question_index], function(error, results, fields) {
            if (error) throw error;
            let jsonQuestionResult = getRealResults(results);
            connection.query("SELECT text FROM question_option WHERE quiz_question_id = ?", [question_index], function(error, results, fields) {
                if (error) throw error;
                let jsonAnswerResult = getRealResults(results);
                console.log(jsonAnswerResult[0]);
                sendQuestionAnswer(senderId, jsonQuestionResult[0].text, jsonAnswerResult[0].text, jsonAnswerResult[1].text, jsonAnswerResult[2].text);
                user.question_index++;
            })
        })
    }
}
}

I increment user.question_index but it doesnt apply when i call processMessage function what is wrong there? Or how to make that when i call quick reply with payload(pass) it will show next column from database?

Define your user variable outside the processMessage. Everytime you call the method it gets reinitialised to default 0. So If you want to persist the value

var user = {
        user_name: '',
        question_index: 0,
    }


function processMessage(event) {
    if (!event.message.is_echo) {
        let message = event.message;
        let senderId = event.sender.id;

    console.log("Received message from senderId: " + senderId);
    console.log("Message is: " + message);
    console.log();



    if (message.quick_reply.payload === 'Pass') {
        connection.query("SELECT text FROM quiz_questions WHERE quiz_id = ?", [question_index], function(error, results, fields) {
            if (error) throw error;
            let jsonQuestionResult = getRealResults(results);
            connection.query("SELECT text FROM question_option WHERE quiz_question_id = ?", [question_index], function(error, results, fields) {
                if (error) throw error;
                let jsonAnswerResult = getRealResults(results);
                console.log(jsonAnswerResult[0]);
                sendQuestionAnswer(senderId, jsonQuestionResult[0].text, jsonAnswerResult[0].text, jsonAnswerResult[1].text, jsonAnswerResult[2].text);
                user.question_index++;
            })
        })
    }
}
}