1.1.0 • Public • Published


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Node.js and JavaScript bindings for Apostle.io.

You can use this library to send emails via Apostle.io from both the server and the client. The Apostle.io delivery API supports Cross Origin Resource Sharing (CORS).

Node Installation

Installing via NPM

npm install apostle.io

In your code

var apostle = require("apostle.io");

Browser Installation

Installing via Bower

bower install apostle

Installing manually

Download the latest code from GitHub, and include lib/index.js in your html.

Apostle.js depends on Superagent, which you will need to make available to the browser too.


Domain Key

You will need to provide your apostle domain key to send emails.

apostle.domainKey = "Your domain key";

Sending Email

Sending an email is easy, a minimal example may look like this.

apostle.deliver('welcome_email', {email: 'mal@apostle.io'});

You can pass any information that your Apostle.io template might need.

var order = {
    items: ['Widget frame', 'Widget chain', 'Widget seat'],
    id: "abc123"
apostle.deliver('order_complete', {
    email: 'mal@apostle.io',
    replyTo: 'support@apostle.io',
    order: order

Sending Email with attachments

Sending an email with attachment. Sample example may look like this.

attachments = apostle.attachment('working.txt','hi its working')
apostle.deliver('welcome_email', {email: 'mal@apostle.io', 'attachments':attachments});


apostle.deliver returns a promise that you can attach success and error callbacks to.

var success = function(){},
    error = function(message, response){};
apostle.deliver().then(success, error);
  • Success does not receive any arguments.
  • In the case of invalid details being passed, no external request will be made and the promise will be rejected. message will be "invalid", and response will be an array of mail messages with an error property.
  • In the case of delivery failure, the promise will be rejected. message will be "error", and response will be a Superagent Response Object. See below for error status codes and their meanings.
var success = function(){},
    error = function(message, response){};
// Invalid Template
apostle.mail(false, {email: 'mal@apostle.io'}).then(success, error);
 * error will receive
 * message: 'invalid'
 * response: [{ email: 'mal@apostle.io', error: 'No template provided'}]
// Invalid Email
apostle.mail('welcome_email', {}).then(success, error);
 * error will receive
 * message: 'invalid'
 * response: [{ template_id: 'welcome_email', error: 'No email provided'}]
// In the case of a server error
apostle.mail('welcome_email', {email: 'mal@apostle.io'}).then(success, error);
 * error will receive
 * message: 'error'
 * response: Superagent Response Object
// Success
apostle.mail('welcome_email', {email: 'mal@apostle.io'}).then(success, error);
 * success will be called with no arguments

Sending multiple emails

You can send multiple emails at once by using a queue. If any of the emails fail validation, no emails will be sent.

var queue = apostle.createQueue();
queue.push('welcome_email', {email: 'mal@apostle.io'});
queue.push('order_email', {email: 'mal@apostle.io', order: order})
queue.deliver().then(success, error);

Failure Responses

When recieving an error callback with message == 'error', it means that the delivery to Apostle.io has failed. There are several circumstances where this might occur. You should check the response.status value to determine your next action. Any 2xx status code is considered a success, and will resolve the returned promise. Shortcut methods are available for some responses. In all cases, except a server error, you can check response.body.message for more information.

  • response.unauthorized, response.status == 401 – Authorization failed. Either no domain key, or an invalid domain key was supplied.
  • response.badRequest, response.status == 400 – Either no json, or invalid json was supplied to the delivery endpoint. This should not occur when using the library correctly.
  • response.status == 422 – Unprocessable entitity. An invalid payload was supplied, usually a missing email or template id, or no recipients key. Apostle.js should validate before sending, so it is unlikely you will see this response.
  • response.serverError, response.status == 500 – Server error occured. Something went wrong at the Apostle API, you should try again with exponential backoff.


Created with ♥ by Mal Curtis (@snikchnz)


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request




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