SendGrid's smtpapi library in NodeJS
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Latest commit eafe721 Dec 21, 2017

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This node module allows you to quickly and more easily generate SendGrid X-SMTPAPI headers.


All updates to this module are documented in our CHANGELOG.

Table of Contents



  • Node.js version 0.10, 0.12 or 4
  • The SendGrid service, starting at the free level

Environment Variables

Update your environment with your SendGrid credentials. (if you will be sending via nodemailer or other SMTP transport)

echo "export SENDGRID_USERNAME='YOUR_USERNAME'" > sendgrid.env
echo "export SENDGRID_PASSWORD='YOUR_PASSWORD'" >> sendgrid.env
echo "sendgrid.env" >> .gitignore
source ./sendgrid.env

The following recommended installation requires npm. If you are unfamiliar with npm, see the npm docs. Npm comes installed with Node.js since node version 0.8.x therefore you likely already have it.

Add the following to your package.json file:

  "dependencies": {
    "smtpapi": "1.3.1"

Install smtpapi-nodejs and its dependencies:

npm install


Quick Start

var smtpapi   = require('smtpapi');
var header    = new smtpapi();
header.setUniqueArgs({cow: 'chicken'});



If you are interested in the future direction of this project, please take a look at our milestones. We would love to hear your feedback.

How to Contribute

We encourage contribution to our projects, please see our CONTRIBUTING guide for details.

Quick links:


smtpapi-nodejs is guided and supported by the SendGrid Developer Experience Team.

smtpapi-nodejs is maintained and funded by SendGrid, Inc. The names and logos for smtpapi-nodejs are trademarks of SendGrid, Inc.


The MIT License (MIT)