Express With Nodemailer

you can install Nodemailer with npm :

npm install nodemailer --save

or with yarn :

yarn add nodemailer

1. Folder Structure

.
+ node_modules
+ app.js
+ package.json

2. Get ClientId and Secret :

• Create a project on console.developers.google.com.
• Search: Gmail API then click Enable.
• Go to Credentials, click Oauth Consent Screen tab.
• Type the project name, then save.
• Create credentials, choose Oauth Application ID.
• On Application type, choose Web Application.
• On Authorized redirect URI type: https://developers.google.com/oauthplayground
• Click Create, then enjoy your ClientId & ClientSecret!

3. Get RefreshToken :

• Go to https://developers.google.com/oauthplayground/.
• Click OAuth2 configuration (gear icon).
• Check Use your own Oauth credentials.
• Input your ClientId & ClientSecret.
• On textbox scopes, input https://mail.google.com/.
• Click Authorize App then allow it.
• Click Exchange authorization code for token.
• Check Auto-refresh the token before it expires.
• Enjoy your Refresh Token!