Services can be thought of as libraries which contain functions that you might want to use in many places of your application. For example, you might have an Email service which wraps some default email message boilerplate code that you would want to use in many parts of your application.

Simply create a JavaScript file containing a function or an object into your ./api/<apiName>/services directory.

For example, you could have an Email service like this:

const nodemailer = require('nodemailer');

module.exports = {
  sendEmail: function (from, to, subject, text) {

    // Create reusable transporter object using SMTP transport
    const transporter = nodemailer.createTransport({
      service: 'Gmail',
      auth: {
        user: '',
        pass: 'userpass'

    // Setup e-mail data
    const options = {
      from: from,
      to: to,
      subject: subject,
      text: text

    // Send mail
    transporter.sendMail(options, function(error, info){
      if (error) {
        return false;

      console.log('Message sent: ' + info.response);