main.js

var sendgrid = require("sendgrid");
sendgrid.initialize("SendGrid_Auth_User", "SendGrid_Auth_token");

// Use Parse.Cloud.define to define as many cloud functions as you want.
// For example:
Parse.Cloud.define("hello", function(request, response) {
  response.success("Hello world!");
});

Parse.Cloud.define("emailGrocery", function(request, response) {
  sendgrid.sendEmail({
    to: "emailto@youraddress.com",
    from: "emailfrom@sender.com",
    subject: "Here is your grocery list",
    text: request.params.text,
    html: request.params.text
  }, {
    success: function(httpResponse) { response.success("Email sent!"); },
    error: function(httpResponse) { response.error("Uh oh, something went wrong"); }
  });
});