How to send an email from JavaScript


How to send an email from JavaScript

I want my website to have the ability to send an email without refreshing the page. So I want to use Javascript.

Enter Friend’s Email:

Here is how I want to call the function, but I’m not sure what to put into the javascript function. From the research I’ve done I found an example that uses the mailto method, but my understanding is that doesn’t actually send directly from the site.
So my question is where can I find what to put inside the JavaScript function to send an email directly from the website.
function sendMail() {
/* …code here… */


Solution 1:

You can’t send an email directly with javascript.

You can, however, open the user’s mail client:'');

There are also some parameters to pre-fill the subject and the body:'');

Another solution would be to do an ajax call to your server, so that the server sends the email. Be careful not to allow anyone to send any email through your server.

Solution 2:

Indirect via Your Server – Calling 3rd Party API – secure and recommended

Your server can call the 3rd Party API after proper authentication and authorization. The API Keys are not exposed to client.


var mandrill = require('node-mandrill')('<your API Key>'); 

function sendEmail ( _name, _email, _subject, _message) {
    mandrill('/messages/send', {
        message: {
            to: [{email: _email , name: _name}],
            from_email: '',
            subject: _subject,
            text: _message
    }, function(error, response){
        if (error) console.log( error );
        else console.log(response);

// define your own email api which points to your server. '/api/sendemail/', function(req, res){

    var _name =;
    var _email =;
    var _subject = req.body.subject;
    var _messsage = req.body.message;

    //implement your spam protection or checks. 

    sendEmail ( _name, _email, _subject, _message );


and then use use $.ajax on client to call your email API.

Directly From Client – Calling 3rd Party API – not recomended

Send an email using only JavaScript

in short: 
1. register for Mandrill to get an API key
2. load jQuery
3. use $.ajax to send an email

Like this –

function sendMail() {
      type: 'POST',
      url: '',
      data: {
        'key': 'YOUR API KEY HERE',
        'message': {
          'from_email': 'YOUR@EMAIL.HERE',
          'to': [
                'email': 'RECIPIENT@EMAIL.HERE',
                'name': 'RECIPIENT NAME (OPTIONAL)',
                'type': 'to'
          'autotext': 'true',
          'subject': 'YOUR SUBJECT HERE!',
     }).done(function(response) {
       console.log(response); // if you're into that sorta thing

Note: Keep in mind that your API key is visible to anyone, so any malicious user may use your key to send out emails that can eat up your quota.

Solution 3:

I couldn’t find an answer that really satisfied the original question.

  • Mandrill is not desirable due to it’s new pricing policy, plus it required a backend service if you wanted to keep your credentials safe.
  • It’s often preferable to hide your email so you don’t end up on any lists (the mailto solution exposes this issue, and isn’t convenient for most users).
  • It’s a hassle to set up sendMail or require a backend at all just to send an email.

I put together a simple free service that allows you to make a standard HTTP POST request to send an email. It’s called PostMail, and you can simply post a form, use Javascript or jQuery. When you sign up, it provides you with code that you can copy & paste into your website. Here are some examples:


<form id="javascript_form">
    <input type="text" name="subject" placeholder="Subject" />
    <textarea name="text" placeholder="Message"></textarea>
    <input type="submit" id="js_send" value="Send" />


    //update this with your js_form selector
    var form_id_js = "javascript_form";

    var data_js = {
        "access_token": "{your access token}" // sent after you sign up

    function js_onSuccess() {
        // remove this to avoid redirect
        window.location = window.location.pathname + "?message=Email+Successfully+Sent%21&isError=0";

    function js_onError(error) {
        // remove this to avoid redirect
        window.location = window.location.pathname + "?message=Email+could+not+be+sent.&isError=1";

    var sendButton = document.getElementById("js_send");

    function js_send() {
        var request = new XMLHttpRequest();
        request.onreadystatechange = function() {
            if (request.readyState == 4 && request.status == 200) {
            } else
            if(request.readyState == 4) {

        var subject = document.querySelector("#" + form_id_js + " [name='subject']").value;
        var message = document.querySelector("#" + form_id_js + " [name='text']").value;
        data_js['subject'] = subject;
        data_js['text'] = message;
        var params = toParams(data_js);"POST", "", true);
        request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");


        return false;

    sendButton.onclick = js_send;

    function toParams(data_js) {
        var form_data = [];
        for ( var key in data_js ) {
            form_data.push(encodeURIComponent(key) + "=" + encodeURIComponent(data_js[key]));

        return form_data.join("&");

    var js_form = document.getElementById(form_id_js);
    js_form.addEventListener("submit", function (e) {


<form id="jquery_form">
    <input type="text" name="subject" placeholder="Subject" />
    <textarea name="text" placeholder="Message" ></textarea>
    <input type="submit" name="send" value="Send" />


    //update this with your $form selector
    var form_id = "jquery_form";

    var data = {
        "access_token": "{your access token}" // sent after you sign up

    function onSuccess() {
        // remove this to avoid redirect
        window.location = window.location.pathname + "?message=Email+Successfully+Sent%21&isError=0";

    function onError(error) {
        // remove this to avoid redirect
        window.location = window.location.pathname + "?message=Email+could+not+be+sent.&isError=1";

    var sendButton = $("#" + form_id + " [name='send']");

    function send() {

        var subject = $("#" + form_id + " [name='subject']").val();
        var message = $("#" + form_id + " [name='text']").val();
        data['subject'] = subject;
        data['text'] = message;


        return false;

    sendButton.on('click', send);

    var $form = $("#" + form_id);
    $form.submit(function( event ) {

Again, in full disclosure, I created this service because I could not find a suitable answer.

Solution 4:

You can find what to put inside the JavaScript function in this post.

function getAjax() {
    try {
        if (window.XMLHttpRequest) {
            return new XMLHttpRequest();
        } else if (window.ActiveXObject) {
            try {
                return new ActiveXObject('Msxml2.XMLHTTP');
            } catch (try_again) {
                return new ActiveXObject('Microsoft.XMLHTTP');
    } catch (fail) {
        return null;

function sendMail(to, subject) {
     var rq = getAjax();

     if (rq) {
         // Success; attempt to use an Ajax request to a PHP script to send the e-mail
         try {
   'GET', 'sendmail.php?to=' + encodeURIComponent(to) + '&subject=' + encodeURIComponent(subject) + '&d=' + new Date().getTime().toString(), true);

             rq.onreadystatechange = function () {
                 if (this.readyState === 4) {
                     if (this.status >= 400) {
                         // The request failed; fall back to e-mail client
               'mailto:' + to + '?subject=' + encodeURIComponent(subject));

         } catch (fail) {
             // Failed to open the request; fall back to e-mail client
   'mailto:' + to + '?subject=' + encodeURIComponent(subject));
     } else {
         // Failed to create the request; fall back to e-mail client'mailto:' + to + '?subject=' + encodeURIComponent(subject));

Provide your own PHP (or whatever language) script to send the e-mail.

Solution 5:

I am breaking the news to you. You CAN’T send an email with JavaScript per se.

Based on the context of the OP’s question, my answer above does not hold true anymore as pointed out by @KennyEvitt in the comments. Looks like you can use JavaScript as an SMTP client.

However, I have not digged deeper to find out if it’s secure & cross-browser compatible enough. So, I can neither encourage nor discourage you to use it. Use at your own risk.

Solution 6:

There seems to be a new solution at the horizon. It’s called EmailJS. They claim that no server code is needed. You can request an invitation.

Update August 2016: EmailJS seems to be live already. You can send up to 200 emails per month for free and it offers subscriptions for higher volumes.