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Send Verification Mail on User Registration Node Js without SSL certificate Solution - self signed certificate in certificate chain nodejs

First do npm install nodemailer   & then import it in backend code   

========== Backend Code ===

create EmailAPI.js file in your router folder & then import it to your IndexRouter.js file 

// EmailAPI.js 

import nodemailer from 'nodemailer';


var sendMail=(email,password,token)=>{

   process.env.NODE_TLS_REJECT_UNAUTHORIZED='0'


var transporter = nodemailer.createTransport({

  service: 'gmail',

  auth: {

    user: 'vasubirla@gmail.com',

    pass: 'mtvrqzmxlarnrg9h' // Create your own temporary password from Google setting  

  }

});


var mailOptions = {

  from: 'vasubirla@gmail.com',

  to: email,

  subject: 'Verification Mail MyApp',

  html: "<h1>Welcome To MyApp</h1><p>you have successfully register to our app , your login credentials are attached below</p><h3>Email : "+email+"</h3><h3>Password : "+password+"<h3>OTP for account verification is </h3>"  + "<h1 style='font-weight:bold;'>" + otp +"</h1>"+"</h3><br><h2>Click on the link below to verify your account</h2>http://localhost:3000/verifyUser/"+email+'/'+token

};


transporter.sendMail(mailOptions, function(error, info){

  if (error) {

    console.log(error);

  } else {

    console.log('Email sent: ' + info.response);

  }

}); 


}


export default sendMail;

============================================================end EmailAPI,js


// IndexRouter.js Start 

router.post("/register",(req,res)=>{

      IndexController.registerUser(req.body).then((result)=>{

    var token = result.token;

      sendEmail(req.body.email,req.body.password,token);

      res.render("register",{"output":"User register successfully..."});

         

 }).catch((err)=>{

       res.render("register",{"output":err});

    //console.log(err);

 });


});


=========================================end IndexRouter.js


   IndexController.registerUser(req.body).then((result)=>{


      res.render("register",{"output":"User register successfully..."});

 }).catch((err)=>{

    res.render("register",{"output":err});

 });




 //res.json(req.body);

});

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