Code to send emails with HTML Body using NodeJS and SendGrid

index.js

const express = require("express");
const mail = require("@sendgrid/mail");

const app = express();

// It is highly recommended to store the API Keys in a seperate file and DO NOT check it in Git 
mail.setApiKey("__sendgrid_api_key__");

app.post('/email/send', (req, res) => {
    // Any 1 of to, cc or bcc are required to successfully send an email.
    const message = {
        to: ["__email1@domain.com__", "__email2@domain.com__"],
        cc: ["__email1@domain.com__", "__email2@domain.com__"],
        bcc: ["__email1@domain.com__", "__email2@domain.com__"],
        from: {
            name: 'Rishav Kumar',
            email: 'hi@whoisrishav.com'
        },
        replyTo: 'hi@whoisrishav.com',
        subject: "__Subject of the email__",
        html: ```__Your multiline html content__```,
        attachments: [{...}, {...}],
    };

    mail.send(message).then(() => {
        res.status(200).send({
            message: 'Email sent successfully!'
        });
    }).catch((err) => {
        res.status(500).send({
            message: 'Email not sent!',
            error: err.message
        });
    });
})

let port = process.env.PORT || 3000;

app.listen(port, () => {
    console.log("Webserver running on 3000");
});