NodeMailer Invalid Login

Question

I am new to node.js programming .I am using nodemailer module for sending emails.

const nodemailer = require ('nodemailer'),
credentials=require('./credentials.js');
var mailTransport=nodemailer.createTransport({
    service:'Gmail',
    auth: {
        user : credentials.gmail.user,
        pass : credentials.gmail.password,
    }
});
function sendMail(mail_id){
    mailTransport.sendMail({
        from: ' "my name" <[email protected]>',
        to : mail_id,   //[email protected]
        subject : 'Hello',
        text: "Hello How do u do ?",
    },function(err,info){
        if(err){
            console.log('Unable to send the mail :'+err.message);
        }
        else{
            console.log('Message response : '+info.response);
        }
    });
}
exports.sendMail=sendMail;

This is my program for sending emails to different users. But I am getting Invalid Login . I don't have any idea why this is coming . I am new to node.js and server side scripting.
I am using my gmail username and password for credentials.
Please help me.

Answer 1

One reason could be the 'modern security standard' protection from Gmail.

Check you gmail inbox for any new mail having subject "Google Account: sign-in attempt blocked"

If yes, open the mail and click on the link https://www.google.com/settings/security/lesssecureapps

set 'Access for less secure apps' to 'Turn on'. Try again, it should be working now.