Node.js Contact Form: How to Create One, Validate Data, and Send Emails

A step-by-step tutorial explains how to build a Node.js contact form using Express for the server, Nodemailer for SMTP email delivery, and static HTML, CSS, and JavaScript files for the interface. It covers project initialization, environment-variable management with built-in support or dotenv, serving the form, and using the Fetch API to submit form data asynchronously to a server endpoint. The tutorial outlines validation of required fields and email addresses through either the deep-email-validator package or regular expressions, then adds Google reCAPTCHA v2 to help prevent automated submissions. It demonstrates sending submitted messages through Mailtrap using either an SMTP transporter configured with Nodemailer or Mailtrap’s API client, with credentials stored in a .env file. The examples return JSON success and error responses, use the sender’s address as the reply-to field, and note that the provided API example handles plain-text messages while additional formats such as HTML, images, and attachments require further implementation.

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