Nodejs mysql operations

server.js

var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var mysql = require('mysql');
var con = mysql.createConnection({
    host:"localhost",
    user:"root",
    passsword:"sree",
    database:"emp"
});

con.connect((err) =>{
    if(err) throw err;
    console.log('connected');
})
app.use( bodyParser.json() );       // to support JSON-encoded bodies
app.use(bodyParser.urlencoded({     // to support URL-encoded bodies
  extended: true
})); 

app.use(express.static('public'));

app.get('/', function (req, res) {
    res.sendFile( __dirname + "/" + "main.html" );
});

app.get('/display',function(req, res){
    let sql = `SELECT * FROM details ORDER By id`;
    operations(sql, res);
})

app.post('/edit', (req, res) => {
    console.log(req.body);
    let sql = `UPDATE details SET name='${req.body.emName}', designation='${req.body.emDes}', company='${req.body.emCom}', email='${req.body.emEmail}' WHERE id=${req.body.emId}`;
    operations(sql, res);
})
function operations(sql, res){
    let response = {};
    con.query(sql, function(err, result, fields) {
        if(err){
            response.successful = false;
            console.error(err);
            console.log(JSON.stringify(result));
            res.send(JSON.stringify(response));
            return response;
        }else{
            if(Array.isArray(result)){
                if(result.length>0){
                    response.data = result;
                    response.successful = true;
                   
                    res.send(JSON.stringify(response));
                    return response;
                }else{
                    response.successful = false;
                   
                    res.send(JSON.stringify(response));
                    return response;
                }
            }else{
                if(result.affectedRows>0){
                    response.successful = true;
                   
                    res.send(JSON.stringify(response));
                    return response;
                }else{
                    response.successful = false;
                    
                    res.send(JSON.stringify(response));
                    return response;
                }
            }
        }
    })
}
var server = app.listen(8081);