How to Send Emails in Node.js: Nodemailer, EmailJS, and email API Methods Explained

Node.js applications can send email through SMTP-backed libraries such as Nodemailer and emailjs or through an email API such as Mailtrap’s Node.js package. Nodemailer is presented as a feature-rich, widely supported option that supports HTML, Unicode, attachments, OAuth2, connection pooling, and several transport methods, while emailjs is a lighter alternative with more limited ecosystem support. The material demonstrates configuring SMTP transports, composing and sending messages, and using the email-templates package with Pug to create dynamic transactional emails such as registration confirmations. It also explains Mailtrap API-based sending after domain verification, including plain-text and HTML messages, custom variables, multiple recipients, attachments, embedded images, and asynchronous delivery using promises. For high-volume campaigns, it recommends concurrent operations with Promise.all and using a dedicated bulk stream, while advising developers to protect credentials through environment variables and configure ES module support where required.

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