Nodejs + Mysql, How do I find a name if already exist before inserting the name?

Hi I’m learning nodejs with mysql. I have crated a method to post a name in database. But now I want to execute another method which first check if name does not exist then run post name method

NOTE My table only containes ‘nick_names’ column

Here is my route in router file router.post(‘/’, NickNamesController.createName)

Actual result-> I can post names here: Controller.js

exports.createName = (req, res) => {
  const reqData = new NickNamesModel(req.body);
  NickNamesModel.addNewName(reqData , (err, name) => {
            if (err){
                return res.status(400).send(err.code);
            }
            res.status(201).send({success: true, message: 'Name has been inserted successfully', data: name});
        });
  
}

Expected: Controller.js Please have a look here This is what I want to achieve

exports.createName = (req, res) => {
  const reqData = new NickNamesModel(req.body);

// first check if name exist or not?
  const ifExist = NickNamesModel.getNameIfExist(reqData.nick_name, (err, name) => {
       if(err){
           return err.code;
        }
      return name;
})

// checking if ifExist has 1 then value already exist. If 0 then not exist
  if(ifExist != 0) {
    return res.status(400).send({success: false, message: Duplicate Name});
} else {
  NickNamesModel.addNewName(reqData , (err, name) => {
            if (err){
                return res.status(400).send(err.code);
            }
            res.status(201).send({success: true, message: 'Name has been inserted successfully', data: name});
        });
  }
  
}

NickNamesModel.js

NickNamesModel.addNewName = (reqData, result) => {
    dbConn.query('INSERT INTO nick_name_table SET ? ', reqData, (err, res) => {
        if (err) {
            console.log('Error while inserting name', err);
            result(err, null);
        }else {
            console.log('Name inserted successfully');
            result(null, res);
        }
    })
}

// Method to check if nick name already exist then return 1 else 0
NickNamesModel.getNameIfExist = (nick_name, result) => {
    dbConn.query('SELECT EXISTS('SELECT station_name FROM stations SET WHERE station_name=? LIMIT 1)', nick_name, (err, res) => {
        if (err){
            console.log('Error while fetching stations', err);
            result(null, err);
        } else {
            console.log('Stations fetched successfully');
            result(null, res)
        }
    })
}