How to Send Emails in Next.js using Client & Server-Side Methods: A Complete Guide

A tutorial explains how to add email capabilities to a Next.js App Router project for contact forms, notifications, password resets, and related use cases, beginning with project creation through create-next-app and an overview of client and server code organization. It presents three approaches: EmailJS for browser-side sending without a custom backend, Nodemailer with Mailtrap SMTP through secure Next.js API routes, and Mailtrap’s Node.js SDK for API-based delivery. The EmailJS workflow covers dashboard configuration, templates, public environment variables, SDK installation, and a client contact form, while the server-side alternatives protect SMTP passwords or API tokens in non-public environment variables and process requests through route handlers. Examples show how to submit form data, return success or error statuses, send plain-text and HTML messages, add multiple recipients, and process multipart file attachments, converting files into formats accepted by Nodemailer or the Mailtrap API. It also emphasizes using verified sender domains, matching form field names to template placeholders, and providing plain-text fallbacks for HTML emails.

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