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JavaScript

How to execute mongoose queries in sync ?

/* POST Register User  */
router.post('/register',function(req,res,next){

    let user = req.body;
    //checking for empty field in a form
    for(let key in user){
        if(user[key] === ""){
            return next(mid.error("All fields are required to fill"));
        }
    }

    User.findOne({username:user.username})
        .exec(function(err,user){
            if(err){
                return next(mid.error("Something went wrong"));
            }
            if(user){
                return next(mid.error("Username already exist"));
            }
    });

    User.findOne({email:user.email})
        .exec(function(err,user){
            if(err){
                return next(mid.error("Something went wrong"));
            }
            if(user){
                return next(mid.error("Email already exist"));
            }
    });

    //matching password 
    if(user.password !== user.confirm){
        return next(mid.error("Password not matched.Try again !"));
    }

    //save data in object
    let userData = {
        username : user.username,
        email    : user.email,
        password : user.password
    };

    //save data in database

    User.create(userData,function(err,user){
        if(err){
            return next(mid.error("Something went wrong.Try again !!!"));
        } else {
            req.session.userID = user._id;
            return res.redirect('/home');
        } 

    });



});