Send emails from your SvelteKit application using Nodemailer and Brevo

Installation

First, let's start with installing the required packages. Open your terminal and run:

npm i nodemailer nodemailer-brevo-transport

Setting Up Brevo

Before we proceed, you'll need to set up an API key with Brevo:

1. Visit Brevo's website and log in or sign up.
2. Navigate to the API section and create a new API key.
3. Copy the API key and add it to your project's .env file for safekeeping:

# In your .env file
VITE_BREVO_API='your-brevo-api-key-here'

Ensure you replace 'your-brevo-api-key-here' with your actual Brevo API key.

Preparing the Email Utility

Create a file named sendMail.js in your project's lib folder. This file will house our email-sending logic.

First, import the environment variable where we stored our Brevo API key:

// sendMail.js
let brevoAPI = import.meta.env.VITE_BREVO_API;

Then, import Nodemailer and the Brevo transport module:

import nodemailer from 'nodemailer';
import brevoTransport from 'nodemailer-brevo-transport';

Configuring the Transporter

Set up the transporter object which Nodemailer will use to send emails:

const transporter = nodemailer.createTransport(new brevoTransport({
  apiKey: brevoAPI
}));

Writing the Mail Sending Function

Now, let's write a function to handle the email sending process:

export async function mailPost(request) {
  // Extract the necessary details from the request body
  const { user_name, user_email, user_detail } = request.body;

  // Configure your mail options
  const mailOptions = {
    from: user_email, // Sender's email
    to: 'yourMail@gmail.com', // Replace with your email
    subject: `New message from (${user_name})`,
    html: user_detail, // For HTML body content
    text: user_detail // For plain text body content
  };

  // Attempt to send the email
  try {
    await transporter.sendMail(mailOptions);
    return {
      status: 200,
      body: 'Email sent successfully'
    };
  } catch (error) {
    console.error(error);
    return {
      status: 500,
      body: 'Failed to send email. Please try again'
    };
  }
}

Integration with SvelteKit

Finally, integrate the mailPost function within your SvelteKit endpoint +page.server.js, to handle form submissions:

// In your +page.server.js

// Logic to handle form validation and submission...
if (!formData.valid) {
  return message(formData, {
    text: 'Please correct your form submission.',
    status: 400
  });
} else {
  const response = await mailPost({ body: { user_name, user_email, user_detail } });

  // Check the response status and act accordingly
    if (response.status === 200) {
        return message(formData, {
            text: 'Your opinion has been received. Thank you!',
            status: 200
        });
    } else {
        console.log('response: ', response);
        return message(formData, { text: response.body, status: response.status });
    }
}