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The SocketLabs Email Delivery Node.js library allows you to easily send email messages via the SocketLabs Injection API. The library makes it easy to build and send any type of message supported by the API, from a simple message to a single recipient all the way to a complex bulk message sent to a group of recipients with unique merge data per recipient.

Table of Contents

Prerequisites and Installation


  • A supported Node.js version (6.0 or higher)
  • A SocketLabs account. If you don't have one yet, you can sign up for a free account to get started.


For most uses we recommend installing the SocketLabs Email Delivery package via npm. If you already have a supported version of Node.js, then it should have included npm automatically. To install the package to your current project, simply type the following in your terminal or command prompt:

> npm install --save @socketlabs/email

Alternately, you can simply clone this repository directly to include the source code in your project.

Getting Started

Obtaining your API Key and SocketLabs ServerId number

In order to get started, you'll need to enable the Injection API feature in the SocketLabs Control Panel. Once logged in, navigate to your SocketLabs server's dashboard (if you only have one server on your account you'll be taken here immediately after logging in). Make note of your 4 or 5 digit ServerId number, as you'll need this along with your API key in order to use the Injection API.

To enable the Injection API, click on the "For Developers" dropdown on the top-level navigation, then choose the "Configure HTTP Injection API" option. Once here, you can enable the feature by choosing the "Enabled" option in the dropdown. Enabling the feature will also generate your API key, which you'll need (along with your ServerId) to start using the API. Be sure to click the "Update" button to save your changes once you are finished.

Basic Message

A basic message is an email message like you'd send from a personal email client such as Outlook. A basic message can have many recipients, including multiple To addresses, CC addresses, and even BCC addresses. You can also send a file attachment in a basic message.

const {SocketLabsClient} = require('@socketlabs/email');
const client = new SocketLabsClient(parseInt(process.env.SOCKETLABS_SERVER_ID), process.env.SOCKETLABS_INJECTION_API_KEY);
const message = {
    to: "",
    from: "",
    subject: "Hello from Node.js",
    textBody: "This message was sent using the SocketLabs Node.js library!",
    htmlBody: "<html>This message was sent using the SocketLabs Node.js library!</html>",
    messageType: 'basic'

A basic message supports up to 50 recipients and supports several different ways to add recipients. We've also provided several helper classes to help you construct your message more easily:

const {SocketLabsClient, BasicMessage, EmailAddress} = require('@socketlabs/email');
const client = new SocketLabsClient(parseInt(process.env.SOCKETLABS_SERVER_ID), process.env.SOCKETLABS_INJECTION_API_KEY);
//Instantiate the BasicMessage class to use built-in properties and helper methods. No need to set the messageType when using 
//the helper classes.
let basicMessage = new BasicMessage();
basicMessage.from = "";
basicMessage.subject = "Hello from Node.js";
basicMessage.textBody = "This message was sent using the SocketLabs Node.js library!";
//Add a recipient by pushing a string to the To array"");
//Add a recipient by pushing an object literal to the To array{emailAddress: "", friendlyName: "Recipent #2"});
//Add a recipient by pushing an EmailAddress object to the To array EmailAddress("", { friendlyName: "Recipient #3" }));
//Use the helper method on the instantiated BasicMessage
basicMessage.addToEmailAddress("", "Recipient #4");
//CC and BCC addresses have all of the same options"");

Bulk Message

A bulk message usually contains a single recipient per message and is generally used to send the same content to many recipients, optionally customizing the message via the use of MergeData. For more information about using Merge data, please see the Injection API documentation.

const {SocketLabsClient, BulkMessage, BulkRecipient} = require('@socketlabs/email');
const client = new SocketLabsClient(parseInt(process.env.SOCKETLABS_SERVER_ID), process.env.SOCKETLABS_INJECTION_API_KEY);
let bulkMessage = new BulkMessage();
bulkMessage.textBody = "Is your favorite color still %%FavoriteColor%%?";
bulkMessage.htmlBody = "<html>Is your favorite color still %%FavoriteColor%%?";
bulkMessage.subject = "Sending a Bulk Message With Merge Fields";
//Use built-in classes and helper methods
let recipient1 = new BulkRecipient("");
recipient1.addMergeData("FavoriteColor", "Green");;
//Use object literals
const recipient2 = { 
    emailAddress: "",  
    friendlyName: "Recipient #2",
    mergeData: [
        { key: "FavoriteColor", value: "Orange" }

Managing API Keys

For ease of demonstration, some of our examples may include the ServerId and API key directly in our code sample. Generally it is not considered a good practice to store sensitive information like this directly in your code. In most cases we recommend the use of Environment Variables.

Examples and Use Cases

In order to demonstrate the many possible use cases for the Node.js library, we've provided an assortment of code examples. These examples demonstrate many different features available to the Injection API and Node.js library, including using templates created in the SocketLabs Email Designer, custom email headers, sending attachments, sending content that is stored in an HTML file, advanced bulk merging, and even pulling recipients from a datasource.

Basic send from SocketLabs Template

This example demonstrates the sending of a piece of content that was created in the SocketLabs Email Designer. This is also known as the API Templates feature.

Basic send from HTML file

This example demonstrates how to read in your HTML content from an HTML file rather than passing in a string directly.

Basic send with file attachment

This example demonstrates how to add a file attachment to your message.

Basic send with embedded image

This example demonstrates how to embed an image in your message.

Basic send with specified character set

This example demonstrates sending with a specific character set.

Basic send with custom email headers

This example demonstrates how to add custom headers to your email message.

Basic send with a web proxy

This example demonstrates how to use a proxy with your HTTP client.

Basic send complex example

This example demonstrates many features of the Basic Send, including adding multiple recipients, adding message and mailing id's, and adding an embedded image.

Bulk send with multiple recipients

This example demonstrates how to send a bulk message to multiple recipients.

Bulk send with complex merge including attachments

This example demonstrates many features of the BulkMessage(), including adding multiple recipients, merge data, and adding an attachment.

Bulk send with recipients pulled from a datasource

This example uses a mock repository class to demonstrate how you would pull your recipients from a database and create a bulk mailing with merge data.

Bulk send with Ascii charset and special characters

This example demonstrates how to send a bulk message with a specified character set and special characters.


The SocketLabs Node.js library and all associated code, including any code samples, are MIT Licensed.


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