How to send transactional email in a NodeJS app using the Mailgun API

                            

                                {
  "name": "mailgun-node-tutorial",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node app.js"
  },
  "dependencies": {
    "express": "4",
    "jade": "*",
    "mailgun-js": "0.5"
  }
}
                            
                        

                            

                                //We're using the express framework and the mailgun-js wrapper
var express = require('express');
var Mailgun = require('mailgun-js');
//init express
var app = express();

//Your api key, from Mailgun’s Control Panel
var api_key = 'MAILGUN-API-KEY';

//Your domain, from the Mailgun Control Panel
var domain = 'YOUR-DOMAIN.com';

//Your sending email address
var from_who = 'your@email.com';

//Tell express to fetch files from the /js directory
app.use(express.static(__dirname + '/js'));
//We're using the Jade templating language because it's fast and neat
app.set('view engine', 'jade')

//Do something when you're landing on the first page
app.get('/', function(req, res) {
//render the index.jade file - input forms for humans
res.render('index', function(err, html) {
if (err) {
// log any error to the console for debug
console.log(err); 
}
else { 
//no error, so send the html to the browser
res.send(html)
};
});
});

// Send a message to the specified email address when you navigate to /submit/someaddr@email.com
// The index redirects here
app.get('/submit/:mail', function(req,res) {

//We pass the api_key and domain to the wrapper, or it won't be able to identify + send emails
var mailgun = new Mailgun({apiKey: api_key, domain: domain});

var data = {
//Specify email data
from: from_who,
//The email to contact
to: req.params.mail,
//Subject and text data  
subject: 'Hello from Mailgun',
html: 'Hello, This is not a plain-text email, I wanted to test some spicy Mailgun sauce in NodeJS! <a href="http://0.0.0.0:3030/validate?' + req.params.mail + '">Click here to add your email address to a mailing list</a>'
}

//Invokes the method to send emails given the above data with the helper library
mailgun.messages().send(data, function (err, body) {
//If there is an error, render the error page
if (err) {
res.render('error', { error : err});
console.log("got an error: ", err);
}
//Else we can greet    and leave
else {
//Here "submitted.jade" is the view file for this landing page 
//We pass the variable "email" from the url parameter in an object rendered by Jade
res.render('submitted', { email : req.params.mail });
console.log(body);
}
});

});

app.get('/validate/:mail', function(req,res) {
var mailgun = new Mailgun({apiKey: api_key, domain: domain});

var members = [
{
address: req.params.mail
}
];
//For the sake of this tutorial you need to create a mailing list on Mailgun.com/cp/lists and put its address below
mailgun.lists('NAME@MAILINGLIST.COM').members().add({ members: members, subscribed: true }, function (err, body) {
console.log(body);
if (err) {
res.send("Error - check console");
}
else {
res.send("Added to mailing list");
}
});

})

app.get('/invoice/:mail', function(req,res){
//Which file to send? I made an empty invoice.txt file in the root directory
//We required the path module here..to find the full path to attach the file!
var path = require("path");
var fp = path.join(__dirname, 'invoice.txt');
//Settings
var mailgun = new Mailgun({apiKey: api_key, domain: domain});

var data = {
from: from_who,
to: req.params.mail,
subject: 'An invoice from your friendly hackers',
text: 'A fake invoice should be attached, it is just an empty text file after all',
attachment: fp
};

//Sending the email with attachment109    mailgun.messages().send(data, function (error, body) {
if (error) {
res.render('error', {error: error});
}
else {
res.send("Attachment is on its way");
console.log("attachment sent", fp);
}
});
})

app.listen(3030);
                            
                        

                            

                                doctype html
html
head
title Mailgun Transactional demo in NodeJS
body
p Welcome to a Mailgun form
form(id="mgform")
label(for="mail") Email
input(type="text" id="mail" placeholder="Youremail@address.com")
button(value="bulk" onclick="mgform.hid=this.value") Send transactional
button(value="list" onclick="mgform.hid=this.value") Add to list
button(value="inv" onclick="mgform.hid=this.value") Send invoice
script(type="text/javascript" src="main.js")
                            
                        

                            

                                doctype html
html
head
title Mailgun Transactional
body
p Well that's awkward: #{error}
                            
                        

                            

                                var vForm = document.getElementById('mgform');
var vInput = document.getElementById('mail');

vForm.onsubmit = function() {
if (this.hid == "bulk") {
location = "/submit/" + encodeURIComponent(vInput.value);
}
if (this.hid == "list") {
location = "/validate/" + encodeURIComponent(vInput.value);
}
if (this.hid == "inv") {
location = "/invoice/" + encodeURIComponent(vInput.value);
}

return false;
}