Missing credentials for "PLAIN" nodemailer

Question

I'm trying to use nodemailer in my contact form to receive feedback and send them directly to an email. This is the form below.

<form method="post" action="/contact">
      <label for="name">Name:</label>
      <input type="text" name="name" placeholder="Enter Your Name" required><br>
      <label for="email">Email:</label>
      <input type="email" name="email" placeholder="Enter Your Email" required><br>
      <label for="feedback">Feedback:</label>
      <textarea name="feedback" placeholder="Enter Feedback Here"></textarea><br>
      <input type="submit" name="sumbit" value="Submit">
</form>

This is what the request in the server side looks like

app.post('/contact',(req,res)=>{
let transporter = nodemailer.createTransport({
    service: 'gmail',
    auth: {
        user: '[email protected]',
        password: 'password'
    }
});
var mailOptions = {
    from: req.body.name + '<' + req.body.email + '>',
    to: '[email protected]',
    subject: 'Plbants Feedback',
    text: req.body.feedback 
};
transporter.sendMail(mailOptions,(err,res)=>{
    if(err){
        console.log(err);
    }
    else {

    }
});

I'm getting the error Missing credentials for "PLAIN". Any help is appreciated, thank you very much.

Answer 1

I was able to solve this problem by using number 3, Set up 3LO authentication, example from the nodemailer documentation (link: https://nodemailer.com/smtp/oauth2/). My code looks like this:

let transporter = nodemailer.createTransport({
    host: 'smtp.gmail.com',
    port: 465,
    secure: true,
    auth: {
        type: 'OAuth2',
        user: '[email protected]',
        clientId: '000000000000-xxx0.apps.googleusercontent.com',
        clientSecret: 'XxxxxXXxX0xxxxxxxx0XXxX0',
        refreshToken: '1/XXxXxsss-xxxXXXXXxXxx0XXXxxXXx0x00xxx',
        accessToken: 'ya29.Xx_XX0xxxxx-xX0X0XxXXxXxXXXxX0x'
    }
});

If you looked at the example in the link that I stated above, you can see there that there is a 'expires' property but in my code i didn't include it and it still works fine.

To get the clientId, clientSecret, refreshToken, and accessToken, I just watched this video https://www.youtube.com/watch?v=JJ44WA_eV8E .

I don't know if this is still helpful to you tho.