React jwt email verification

Question

If I use firebase authentication and log in then I need to check that the email and password is similar of my previous user or not. const nodemailer = require('nodemailer'); const jwt = require('jsonwebtoken');

    service: 'gmail',
    auth: {
        user: secure_configuration.EMAIL_USERNAME,
        pass: secure_configuration.PASSWORD
    }
});
  
const token = jwt.sign({
        data: 'Token Data'  .
    }, 'ourSecretKey', { expiresIn: '10m' }  
);    
  
const mailConfigurations = {
  
    // It should be a string of sender/server email
    from: '[email protected]',
  
    to: '[email protected]',
  
    // Subject of Email
    subject: 'Email Verification',
      
    // This would be the text of email body
    text: `Hi! There, You have recently visited 
           our website and entered your email.
           Please follow the given link to verify your email
           http://localhost:3000/verify/${token} 
           Thanks`
      
};
  
transporter.sendMail(mailConfigurations, function(error, info){
    if (error) throw Error(error);
    console.log('Email Sent Successfully');
    console.log(info);
});````

 i try this code but it's not working