Simple code to send an email using SendGrid with attachments

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) => {
    let {
        to,
        cc,
        bcc,
        from,
        subject,
        text,
        html,
        attachments
    } = req.body;
  
    // Any 1 of to, cc or bcc are required to successfully send an email.
    const message = {
        to,
        cc,
        bcc,
        from: {
            name: from.name,
            email: from.email,
        },
        replyTo: from.email,
        subject,
        text,
        html,
        attachments,
    };

    mail.send(message).then((response) => {
        /*
        * @param {JSONObject} response - Response received from SendGrid. It contains the email id with the key name as sg-mail-id
        */
        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");
});