title: Catch webhook node.js
body: <p>I'm trying to catch a PUT/webhook request that is being made by the Aftership API in node.js. A PUT request is made each time a push notification is needed to be made, I am using Parse to send the notifications but I need some of the data from the webhook. </p>
  
  <p>The header of the webhook looks like <code>Content-Type: application/json</code> And contains this data:</p>
  
  <blockquote>
    <p>ts - UTC unix timestamp that the event occurred</p>
    
    <p>event - the name of the event (for tracking update, the value will be
    'tracking_update')</p>
    
    <p>msg - details about the message for which the event occurred, in the
    following format.</p>
  </blockquote>
  
  <p>How would I go about getting the tracking number, slug and the value for <code>token</code> in the custom fields dictionary in node or js?</p>
  
  <pre><code>{
      "event": "tracking_update",
      "msg": {
          "id": "53aa94fc55ece21582000004",
          "tracking_number": "906587618687",
          "title": "906587618687",
          "origin_country_iso3": null,
          "destination_country_iso3": null,
          "shipment_package_count": 0,
          "active": false,
          "order_id": null,
          "order_id_path": null,
          "customer_name": null,
          "source": "web",
          "emails": [],
          "custom_fields": {},
          "tag": "Delivered",
          "tracked_count": 1,
          "expected_delivery": null,
          "signed_by": "D Johnson",
          "shipment_type": null,
          "tracking_account_number": null,
          "tracking_postal_code": "DA15BU",
          "tracking_ship_date": null,
          "created_at": "2014-06-25T09:23:08+00:00",
          "updated_at": "2014-06-25T09:23:08+00:00",
          "slug": "dx",
          "unique_token": "xk7LesjIgg",
          "checkpoints": [{
              "country_name": null,
              "country_iso3": null,
              "state": null,
              "city": null,
              "zip": null,
              "message": "Signed For by: D Johnson",
              "coordinates": [],
              "tag": "Delivered",
              "created_at": "2014-06-25T09:23:11+00:00",
              "checkpoint_time": "2014-05-02T16:24:38",
              "slug": "dx"
          }]
      },
      "ts": 1403688191
  }
  </code></pre>