How to send an email through node js api to direct the user to the ionic page

I created a confirm email request after signing up. The link sent to the email directs the user to a localhost:3000 which is my API base URL, how can I send it to a localhost:8000 and still have the token working on ionic? Any help is appreciated. Thanks in advance!

//SignUpCode && SendsEmailForVerification

app.post('/insertuser', function (_req, res) {
    var data = JSON.parse(_req.body.data);
    var username = data.username;
    var password = data.password;
    var email = data.email;

    var date = new Date();

    var mail = {
        username: username,
        email: email,
        created: date.toString()
      }

    secret_code = sha1(pnumber) //since pnumber is unique;
    
    const token_mail_verification = jwt.sign(mail, secret_code, { expiresIn: '1d' });

    var url = "http://localhost:3000/verify?username=" + token_mail_verification;

    mysqlConnection.connect(function () {
        var query = "Insert into Customer (Username,Email,Password) values('" + username + "','" + email + "','" + sha1(password) + "')";
        mysqlConnection.query(query, function (err, results, _fields) {
            if (err) {
                console.log(err);
                res.send('Please try again!');
            }
            else {
                if (results.affectedRows > 0) {
                    var mailOptions = {
                        from: 'myemail',
                        to: email,
                        subject: "Account Verification", 
                        text: "Click on the link below to veriy your account " + url,
                    };

                    transporter.sendMail(mailOptions, function (error, info) {
                        if (error) {
                            console.log(error);
                            //Handle error here
                            res.send('Please try again!');
                        } else {
                            console.log('Email sent: ' + info.response);
                            res.send('Thanks for registering! Please confirm your email! We have sent a link!');
                        }
                    });
                }
                else {
                    console.log("Try again");
                    res.send('Please try again!');
                }
            }
        })
    })
});

//CodeToVerifyEmail

app.get('/verify', function (req, res) {
    token = req.query.username;
    if (token) {
        try {
            jwt.verify(token, secret_code, (e, decoded) => {
                if (e) {
                    console.log(e)
                    return res.sendStatus(403)
                } else {
                    var email = decoded.email;

                    mysqlConnection.connect(function () {
                        var query =
                          "UPDATE  Customer  SET  Subscription = 'True' WHERE  Email = '" + email + "'";
                        mysqlConnection.query(query, function (err, results, _fields) {
                            if (err) {
                                console.log(err);
                                res.send('Please try again!');
                            }
                            else{
                                res.send('Email Verified Successfully! Please Login now! ');
                            }
                        });
                      });
                }
            });
        } catch (err) {
            console.log(err)
            return res.sendStatus(403)
        }
    } else {
        return res.sendStatus(403)
    }
});