Setup Nodemailer 2020

This tutorial shows how to setup nodemailer and send mails using node js.

Prerequisites:

• Node js
• Basic knowledge of Google Console

Step 1: Create a simple node or express server

Step 2: Create Client ID in Google Console

• Go to https://console.developers.google.com/
• Login or create a account
• Create a project and select it.
• Go to API & services → Credentials → Create Credentials → OAuth Client ID

• Choose web application
• Enter “https://developers.google.com/oauthplayground” in Authorized redirect URIs.
• Copy your client ID and client Secret.

Step 3: Get refresh_token

• Go to https://developers.google.com/oauthplayground/
• Go to right corner. Click on settings. Enter your client ID and client secret

• On left of page. Enter “ https://mail.google.com/” and click on Authorize APIs

• Click “Exchange authorization code for tokens” button.

• Congrats! You got your refresh token

Step 4: Lets see the code

• Open your terminal in project directory and run

npm install googleapis

• Create a file named oAuth2Client.js

const { google } = require('googleapis');

const { OAuth2 } = google.auth;
// Reusable client
const oAuth2Client = new OAuth2(
'Your Client ID',
'Your Client Secret',
'https://developers.google.com/oauthplayground'
);
oAuth2Client.setCredentials({
refresh_token: 'Your refresh token',
});
module.exports = oAuth2Client;

• Create a file named nodemailer.js

const nodemailer = require('nodemailer');
const oAuth2Client = require('./oAuth2Client');

const accessToken = oAuth2Client.getAccessToken();
const smtpTransport = nodemailer.createTransport({
service: 'gmail',
auth: {
type: 'OAuth2',
user: 'Your OAuth Email', // Your gmail address
clientId: 'Your Client ID',
clientSecret: 'Your Client Secret',
refreshToken: 'Your OAuth refresh token',
accessToken: accessToken,
},
});
module.exports = smtpTransport;

• Import nodemailer in file where you want to use it

const nodemailer = require('./nodemailer');
// Mail options
const mailOptions = {
    from: 'SENDER_EMAIL', 
    to: 'RECEIVER_EMAIL', 
    subject: 'YOUR_SUBJECT', 
    text: 'YOUR_MESSAGE', 
  };
// Send mail
  nodemailer.sendMail(mailOptions, () => {} );
// Close
nodemailer.close();

That's it.

Thanks for reading.