Have you found yourself in a situation where you needed to send emails from your Nuxt application? With Nuxt's server and Mailgun, sending emails directly from your Nuxt 3 app becomes a breeze.

To get started, create a Nuxt 3 app using the following command. Ensure that you have Node.js version 16 or newer installed, along with a text editor and a terminal for running these commands:

npx nuxi@latest init my-app

# select preferred package manager
after the selection, the necessary dependencies will be installed

# initialize git repository
you'll be prompted to initialize a git respository or not

# navigate into your newly created project
cd my-app

# open with vscode
code .

# start the server
yarn dev or npm run dev

Now that our application is up and running, in this tutorial, we'll implement a straightforward sign-up process and send a welcome email to new users upon successful registration. To achieve this, we'll create a signup form where users can enter their information and submit it.

For this tutorial, we will work with the app.vue file in our application. First, let's clean up the content of app.vue. Within this file, we will define a reactive form state to store the data entered by the user. We will also create and style a basic form to gather user inputs.

<script lang="ts" setup>
const form = reactive({
    name: "",
    email: "",
    password: "",
});

const handleSubmission = () => {
    console.log(form);
    alert("Sign up successful!");
};
</script>

<template>
    <form @submit.prevent="handleSubmission">
        <label for="name">
            Name
            <input v-model="form.name" id="name" type="text" placeholder="Enter your name" required />
        </label>
        <label for="email">
            Email
            <input v-model="form.email" id="email" type="email" placeholder="Enter your email" required />
        </label>
        <label for="password">
            Password
            <input  v-model="form.password" id="password" type="password" placeholder="Enter your password" required />
        </label>
        <button type="submit">Sign up</button>
    </form>
</template>

<style scoped>
form {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    margin-top: 30px;
}

form label input {
    box-sizing: border-box;
    width: 100%;
    margin-top: 10px;
    margin-bottom: 15px;
    padding: 15px;
    border: 1px solid #333333;
    border-radius: 10px;
}

form button {
    width: 100%;
    padding: 15px;
    background: #333333;
    color: #FFFFFF;
    border: none;
}
</style>

In the code block above, we declared a reactive form state to store user inputs. Additionally, we designed a basic form to collect the user's name, email, and password. Each input field is binded to a v-model to ensure the form data is synchronized with the state. We've also defined a function to handle the form submission, and this function is attached to the form element using the @submit.prevent directive. The prevent modifier is used to prevent the page from reloading when the form is submitted. You can customize the submission handling according to your specific needs, such as sending the data to a server. However, for this tutorial, we will keep it simple and only log the data to the console and display an alert.

Now, if you fill out the form and click the "Sign up" button, your form details will be logged to the console, and an alert dialog will appear, displaying a success message.

To send an email to the user's email after a successful signup, we will use Nuxt 3's server directory to create an API endpoint. This endpoint will handle email sending. Follow these steps:

• Create an api folder inside the server folder at the root of the application.

• In Nuxt 3, to create an API endpoint, you create a new file in the api folder with the method attached to the name of the file. For instance, if you want to create a GET endpoint named "hello," you would create a file named hello.get.ts if you're using TypeScript or hello.get.js if you're using JavaScript. In this case, we're creating an email endpoint with the POST method since we're sending data.

• Create a file named email.post.ts in the api folder.

• In the email.post.ts endpoint file, we'll export a default function defined with defineEventHandler(). This function will be an asynchronous arrow function that defines the event handler. It'll have an event object as its argument, which represents an incoming event or request.

• We'll asynchronously read the body content of the event by calling a readBody function. Then we assign the content of the event's body to a body variable. This body variable will contain the data that we receive in the request body.

This endpoint we just created will eventually be responsible for processing the data from our sign-up form and sending an email to the user's email address.

export default defineEventHandler(async (event) => {
    const body = await readBody(event);
    console.log(body);
});

Now that we have created an API endpoint accessible at /api/email, let's test it by returning to app.vue. In this step, we will make a POST request to the endpoint using the form's email and name state as the request body. To make this request, we'll utilize useFetch, which is a composable provided by Nuxt.

<script lang="ts" setup>
const form = reactive({
    name: "",
    email: "",
    password: "",
});

const handleSubmission = async () => {
    await useFetch("/api/email", {
        method: "POST",
        body: {
            name: form.name,
            email: form.email,
        },
    });
    console.log(form);
    alert("Sign up successful!");
};
</script>

// rest of the code......

Upon submitting the form, you will notice that the name and email are logged to the terminal. Now, let's proceed to send an email to the user's provided email address. To do this, we need to install mailgun.js since we will be using Mailgun for sending our emails. If you haven't already, you can create an account with Mailgun to get started with their email services.

In this tutorial, we will utilize Mailgun's sandbox domain, which has limitations allowing only authorized email addresses to receive emails. If you wish to send emails to all user email addresses and also connect your domain, consider upgrading your Mailgun account.

• Visit your Mailgun dashboard to copy the domain associated with your Sandbox account.

• We then create a .env file in the root of our application and paste the copied domain into it.

• To send emails from our application, we'll need an API key from Mailgun. You can create an API key by following this link.

MAILGUN_DOMAIN=sandboxxxxxxxxxxxxxxxxxxxxxc.mailgun.org
MAILGUN_API_KEY=f23xxxxxxxxxxxxxxxxxxx-xxxxx-xxxxxx

Next, we'll need to install mailgun.js to handle the email-sending process.

# Install mailgun.js
npm i mailgun.js or yarn add mailgun.js

In the endpoint file, we will begin by importing formData from the form-data package in Node.js, as well as Mailgun from mailgun.js. After the imports, we'll instantiate a Mailgun client by creating a new instance of Mailgun and passing formData as an argument. Then, using the mailgun.client method, we will set up the client with basic authentication credentials, which include the username as 'api' and the API key. The configured client will be assigned to a variable.

Following that, we will create a data object that includes the properties to be sent in the email, such as the sender (from), recipient (to), the subject, and the body of the email. Subsequently, we will call the create method of the message object within the mailgun.client that we assigned to a variable earlier. The create method will receive the domain and the data object as its arguments.

import formData from "form-data";
import Mailgun from "mailgun.js";

export default defineEventHandler(async (event) => {
    const body = await readBody(event);

    const mailgun = new Mailgun(formData);
    const mg = mailgun.client({
        username: "api",
        key: process.env.MAILGUN_API_KEY,
    });

    const data = {
        from: "User <admin@test.test>",
        to: body.email,
        subject: "Welcome to test app!",
        text: `Hi ${body.name}! Welcome to our test app! We're glad to have you onBoard!.`,
    };

    await mg.messages.create(process.env.MAILGUN_DOMAIN, data);
});

With these, every time the signup form is submitted successfully, a welcome email will be sent to the user's provided email address.