Mail

const transporter = nodemailer.createTransport({
    service: 'gmail',
    secure: false,
    port: 25,
    auth : {
        user: "",//hided
        pass: ""//hided
    },
    tls: {
        rejectUnauthorized: false
    }

})

exports.registerController = (req,res) => {
   const{name , email , password} = req.body
   //Extracts the validation errors from a request and makes them available in a Result object.
   const errors = validationResult(req);

   if (!errors.isEmpty()) {
       const firstError = errors.array().map(error => error.msg)[0]
       return res.status(422).json({
           error: firstError
       })
   }
    else{
        User.findOne({
            email
        }).exec((err , user) => {
            //If user exists
            if(user) {
                return res.status(400).json({
                    error: "Email is taken"
                })
            }
        })

        //Generate Token
        const token = jwt.sign({
            name,
            email,
            password
        },
        process.env.JWT_ACCOUNT_ACTIVATION,
        {
            expiresIn: '15min'
        }
        )
        const emailDataRegistration = {
            from: process.env.EMAIL_FROM,
            to : email,
            subject: "Account activation link",
            hmtl: `
            <h1>Please Click on link to activate </h1>
            <p>${process.env.CLIENT_URL}/activate/${token}</p>
            <hr/>
            <p>This email contain sensitive info</p>
            <p>${process.env.CLIENT_URL}
                `
        }

        transporter.sendMail(emailDataRegistration , function(err,info)  {
            if(err){
                console.log(err)
                return;
            }
            console.log("Sent: " + info.response)
        })
    }
}