Send email when Firebase database gets new data [closed] - reactjs

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I am new to NodeJS and Cloud Functions for Firebase, and my website (built in ReactJS) is connected to the Firebase Realtime Database - when customer orders a product all the data he writes in html inputs become stored in my Firebase database.
Now I want to automatically send email containing that data.
From: test#mail.com
Subject: New order for you
Name: "Bla bla"
Product: "Blaa"
you get the point.
I suppose Cloud Functions for Firebase is the answer, could someone help me? What code should I implement in functions/index.js?
EDIT: This is the JSON data from my database:
{
"Email_Message" : {
"-LOOFLA-OFkKY_6Ut03b" : {
"email" : "",
"message" : "",
"name" : ""
}
}
}

Answer 1

Have a look at this official sample from the "Cloud Functions for Firebase Sample Library": https://github.com/firebase/functions-samples/tree/Node-8/email-confirmation
In this sample, the Cloud Function is triggered each time a new node is written (and modified) under the /users main node. You should adapt this path to your own data structure.
Also note that the event handler that is used in the sample is onWrite(), "which triggers when data is created, updated, or deleted in the Realtime Database". If you want to trigger the email sending only when an order is created, you may use the onCreate() handler, see the doc: https://firebase.google.com/docs/functions/database-events
Update, based on your update with the database structure.
Based on your structure you should adapt the Cloud Function sample code as follows:
'use strict';
const functions = require('firebase-functions');
const nodemailer = require('nodemailer');
// Configure the email transport using the default SMTP transport and a GMail account.
// For other types of transports such as Sendgrid see https://nodemailer.com/transports/
// TODO: Configure the `gmail.email` and `gmail.password` Google Cloud environment variables.
const gmailEmail = functions.config().gmail.email;
const gmailPassword = functions.config().gmail.password;
const mailTransport = nodemailer.createTransport({
service: 'gmail',
auth: {
user: gmailEmail,
pass: gmailPassword,
},
});
exports.sendEmailConfirmation = functions.database.ref('/Email_Message/{mailId}').onWrite(async (change) => {
const snapshot = change.after;
const val = snapshot.val();
const mailOptions = {
from: '"......" <youremail#xxxxxxxxx.com>',
to: val.email,
};
// Building Email message.
mailOptions.subject = 'Dear ' + val.name; //for example
mailOptions.text = val.message;
try {
await mailTransport.sendMail(mailOptions);
console.log('email sent to:', val.email);
} catch(error) {
console.error('There was an error while sending the email:', error);
}
return null;
});