// Code for V2
var sendgrid  = require('sendgrid')(sendgrid_api_key);
sendgrid.send({
  to:       'example@example.com',
  from:     'other@example.com',
  subject:  'Hello World',
  text:     'My first email through SendGrid.'
}, function(err, json) {
  if (err) { return console.error(err); }
  console.log(json);
});

// Code for V3
var helper = require('sendgrid').mail
var from_email = new helper.Email("test@example.com")
var to_email = new helper.Email("test@example.com")
var subject = "Hello World from the SendGrid Node.js Library"
var content = new helper.Content("text/plain", "some text here")
var mail = new helper.Mail(from_email, subject, to_email, content)
var sg = require('sendgrid').SendGrid(process.env.SENDGRID_API_KEY)
var requestBody = mail.toJSON()
var request = sg.emptyRequest()
request.method = 'POST'
request.path = '/v3/mail/send'
request.body = requestBody
sg.API(request, function (response) {
  console.log(response.statusCode)
  console.log(response.body)
  console.log(response.headers)
})