diff --git a/README.md b/README.md
index 2e81c33..326519d 100644
--- a/README.md
+++ b/README.md
@@ -97,7 +97,8 @@ $parsed = Array
         )
 
     [url] => https://aaronparecki.com/
-    [code] => 200
+    [code] => 200,
+    [source-format] => mf2+html
 )
 ```
 
@@ -131,6 +132,8 @@ Array
         )
 
     [url] => http://example.com/entry
+
+    [source-format] => mf2+json
 )
 ```
 
@@ -363,7 +366,8 @@ Possible errors are listed below:
     }
   },
   "url":"https://aaronparecki.com/2017/03/01/14/hwc",
-  "code":200
+  "code":200,
+  "source-format":"mf2+html"
 }
 ```
 
@@ -420,7 +424,12 @@ Other properties are returned in the response at the same level as the `data` pr
 
 * `url` - The effective URL that the document was retrieved from. This will be the final URL after following any redirects.
 * `code` - The HTTP response code returned by the URL. Typically this will be 200, but if the URL returned an alternate HTTP code that also included an h-entry (such as a 410 deleted notice with a stub h-entry), you can use this to find out that the original URL was actually deleted.
-
+* `source-format` - Indicates the format of the source URL that was used to generate the parsed result. Possible values are:
+  * `mf2+html`
+  * `mf2+json`
+  * `feed+json`
+  * `xml`
+  * `instagram`/`facebook`/`github`/`xkcd`
 
 #### Feeds
 
diff --git a/controllers/Parse.php b/controllers/Parse.php
index 8a9ef2d..1918eb5 100644
--- a/controllers/Parse.php
+++ b/controllers/Parse.php
@@ -126,6 +126,8 @@ class Parse {
         $data['info'] = $parsed['info'];
       if($request->get('include_original') && isset($parsed['original']))
         $data['original'] = $parsed['original'];
+      if(isset($parsed['source-format']))
+        $data['source-format'] = $parsed['source-format'];
 
       return $this->respond($response, 200, $data);
     }
diff --git a/lib/XRay.php b/lib/XRay.php
index 9670b4c..5b9f972 100644
--- a/lib/XRay.php
+++ b/lib/XRay.php
@@ -40,6 +40,7 @@ class XRay {
       unset($result['original']);
     $result['url'] = $url;
     $result['code'] = isset($result['code']) ? $result['code'] : $code;
+    $result['source-format'] = isset($result['source-format']) ? $result['source-format'] : null;
     return $result;
   }
 
@@ -49,6 +50,7 @@ class XRay {
     if(!isset($opts['include_original']) || !$opts['include_original'])
       unset($result['original']);
     $result['url'] = $url;
+    $result['source-format'] = isset($result['source-format']) ? $result['source-format'] : null;
     return $result;
   }
 
diff --git a/lib/XRay/Formats/Facebook.php b/lib/XRay/Formats/Facebook.php
index 40593fa..4955b0b 100644
--- a/lib/XRay/Formats/Facebook.php
+++ b/lib/XRay/Formats/Facebook.php
@@ -68,7 +68,8 @@ class Facebook extends Format {
 
       return [
         'data' => $event,
-        'original' => $fbObject
+        'original' => $fbObject,
+        'source-format' => 'facebook',
       ];
     }
   }
diff --git a/lib/XRay/Formats/GitHub.php b/lib/XRay/Formats/GitHub.php
index 9ad36b8..9ea94b9 100644
--- a/lib/XRay/Formats/GitHub.php
+++ b/lib/XRay/Formats/GitHub.php
@@ -166,7 +166,8 @@ class GitHub extends Format {
 
     return [
       'data' => $entry,
-      'original' => $json
+      'original' => $json,
+      'source-format' => 'github',
     ];
   }
 
diff --git a/lib/XRay/Formats/HTML.php b/lib/XRay/Formats/HTML.php
index 9bcebec..f2a7554 100644
--- a/lib/XRay/Formats/HTML.php
+++ b/lib/XRay/Formats/HTML.php
@@ -105,6 +105,7 @@ class HTML extends Format {
         }
         $result['original'] = $html;
         $result['url'] = $url; // this will be the effective URL after following redirects
+        $result['source-format'] = 'mf2+html';
       }
     }
     return $result;
diff --git a/lib/XRay/Formats/Hackernews.php b/lib/XRay/Formats/Hackernews.php
index af5c227..5b1dd40 100644
--- a/lib/XRay/Formats/Hackernews.php
+++ b/lib/XRay/Formats/Hackernews.php
@@ -83,7 +83,8 @@ class Hackernews extends Format {
 
     return [
       'data' => $entry,
-      'original' => $json
+      'original' => $json,
+      'source-format' => 'hackernews',
     ];
   }
 
diff --git a/lib/XRay/Formats/Instagram.php b/lib/XRay/Formats/Instagram.php
index f9ff365..274490b 100644
--- a/lib/XRay/Formats/Instagram.php
+++ b/lib/XRay/Formats/Instagram.php
@@ -34,7 +34,8 @@ class Instagram extends Format {
     $card = self::_buildHCardFromInstagramProfile($profileData);
 
     return [
-      'data' => $card
+      'data' => $card,
+      'source-format' => 'instagram',
     ];
   }
 
@@ -61,7 +62,8 @@ class Instagram extends Format {
       'data' => [
         'type' => 'feed',
         'items' => $items,
-      ]
+      ],
+      'source-format' => 'instagram',
     ];
   }
 
@@ -206,7 +208,8 @@ class Instagram extends Format {
         'photo' => $photoData,
         'profiles' => $profiles,
         'locations' => $locations
-      ])
+      ]),
+      'source-format' => 'instagram',
     ];
   }
 
diff --git a/lib/XRay/Formats/JSONFeed.php b/lib/XRay/Formats/JSONFeed.php
index 86e7f77..e2db1e6 100644
--- a/lib/XRay/Formats/JSONFeed.php
+++ b/lib/XRay/Formats/JSONFeed.php
@@ -16,6 +16,7 @@ class JSONFeed extends Format {
         'type' => 'unknown',
       ],
       'url' => $url,
+      'source-format' => 'feed+json',
     ];
 
     if($feed) {
diff --git a/lib/XRay/Formats/Mf2.php b/lib/XRay/Formats/Mf2.php
index 910360c..357ea56 100644
--- a/lib/XRay/Formats/Mf2.php
+++ b/lib/XRay/Formats/Mf2.php
@@ -448,7 +448,7 @@ class Mf2 extends Format {
     $data['post-type'] = \p3k\XRay\PostType::discover($data);
 
     $response = [
-      'data' => $data
+      'data' => $data,
     ];
 
     if(count($refs)) {
diff --git a/lib/XRay/Formats/Mf2Feed.php b/lib/XRay/Formats/Mf2Feed.php
index 04dfad3..acf012b 100644
--- a/lib/XRay/Formats/Mf2Feed.php
+++ b/lib/XRay/Formats/Mf2Feed.php
@@ -67,7 +67,8 @@ trait Mf2Feed {
     }
 
     return [
-      'data' => $data
+      'data' => $data,
+      'source-format' => 'mf2+html',
     ];
   }
 
diff --git a/lib/XRay/Formats/Twitter.php b/lib/XRay/Formats/Twitter.php
index d34c32e..f27847c 100644
--- a/lib/XRay/Formats/Twitter.php
+++ b/lib/XRay/Formats/Twitter.php
@@ -175,6 +175,7 @@ class Twitter extends Format {
     return [
       'data' => $entry,
       'original' => $tweet,
+      'source-format' => 'twitter',
     ];
   }
 
diff --git a/lib/XRay/Formats/XKCD.php b/lib/XRay/Formats/XKCD.php
index ae9c302..987ec08 100644
--- a/lib/XRay/Formats/XKCD.php
+++ b/lib/XRay/Formats/XKCD.php
@@ -60,7 +60,8 @@ class XKCD extends Format {
     $entry['post-type'] = \p3k\XRay\PostType::discover($entry);
 
     $response = [
-      'data' => $entry
+      'data' => $entry,
+      'source-format' => 'xkcd',
     ];
 
     return $response;
diff --git a/lib/XRay/Formats/XML.php b/lib/XRay/Formats/XML.php
index 8b227df..49431d4 100644
--- a/lib/XRay/Formats/XML.php
+++ b/lib/XRay/Formats/XML.php
@@ -18,6 +18,7 @@ class XML extends Format {
         'type' => 'unknown',
       ],
       'url' => $url,
+      'source-format' => 'xml',
     ];
 
     try {
diff --git a/lib/XRay/Parser.php b/lib/XRay/Parser.php
index 949a3b8..dda17f8 100644
--- a/lib/XRay/Parser.php
+++ b/lib/XRay/Parser.php
@@ -44,7 +44,9 @@ class Parser {
 
     // Check if an mf2 JSON object was passed in
     if(is_array($body) && isset($body['items'][0]['type']) && isset($body['items'][0]['properties'])) {
-      return Formats\Mf2::parse($body, $url, $this->http, $opts);
+      $data = Formats\Mf2::parse($body, $url, $this->http, $opts);
+      $data['source-format'] = 'mf2+json';
+      return $data;
     }
 
     if(substr($body, 0, 5) == '<?xml') {
@@ -57,12 +59,16 @@ class Parser {
         return Formats\JSONFeed::parse($feeddata, $url);
       } elseif($feeddata && isset($feeddata['items'][0]['type']) && isset($feeddata['items'][0]['properties'])) {
         // Check if an mf2 JSON object was passed in
-        return Formats\Mf2::parse($feeddata, $url, $this->http, $opts);
+        $data = Formats\Mf2::parse($feeddata, $url, $this->http, $opts);
+        $data['source-format'] = 'mf2+json';
+        return $data;
       }
     }
 
     // No special parsers matched, parse for Microformats now
-    return Formats\HTML::parse($this->http, $body, $url, $opts);
+    $data = Formats\HTML::parse($this->http, $body, $url, $opts);
+    $data['source-format'] = 'mf2+html';
+    return $data;
   }
 
 }
diff --git a/tests/AuthorTest.php b/tests/AuthorTest.php
index 975468b..b40eee6 100644
--- a/tests/AuthorTest.php
+++ b/tests/AuthorTest.php
@@ -26,6 +26,7 @@ class AuthorTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
 
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEmpty($data->data->author->url);
     $this->assertEquals('Author Name', $data->data->author->name);
     $this->assertEmpty($data->data->author->photo);
diff --git a/tests/FacebookTest.php b/tests/FacebookTest.php
index 0b4df22..37c0d49 100644
--- a/tests/FacebookTest.php
+++ b/tests/FacebookTest.php
@@ -31,6 +31,9 @@ class FacebookTest extends PHPUnit_Framework_TestCase {
 
     $data = $this->parse(['url' => $url, 'body' => $json]);
 
+    $this->assertArrayHasKey('code', $data);
+    $this->assertEquals('facebook', $data['source-format']);
+
     $this->assertEquals('event', $data['data']['type']);
     $this->assertEquals('event', $data['data']['post-type']);
     $this->assertEquals('IndieWeb Summit', $data['data']['name']);
@@ -58,6 +61,9 @@ class FacebookTest extends PHPUnit_Framework_TestCase {
 
     $data = $this->parse(['url' => $url, 'body' => $json]);
 
+    $this->assertArrayHasKey('code', $data);
+    $this->assertEquals('facebook', $data['source-format']);
+
     $this->assertEquals('event', $data['data']['type']);
     $this->assertEquals('event', $data['data']['post-type']);
     $this->assertEquals('Homebrew Website Club', $data['data']['name']);
diff --git a/tests/FeedTest.php b/tests/FeedTest.php
index 1671ef5..6a115c5 100644
--- a/tests/FeedTest.php
+++ b/tests/FeedTest.php
@@ -24,8 +24,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('mf2+html', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals('feed', $data->type);
     $this->assertEquals(4, count($data->items));
     $this->assertEquals('One', $data->items[0]->name);
@@ -42,8 +43,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('mf2+html', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals('feed', $data->type);
     $this->assertEquals(4, count($data->items));
     $this->assertEquals('One', $data->items[0]->name);
@@ -65,8 +67,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('mf2+html', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals('feed', $data->type);
     // This test should find the h-entry rather than the h-card, because expect=feed
     $this->assertEquals('entry', $data->items[0]->type);
@@ -80,8 +83,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('mf2+html', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals('feed', $data->type);
     $this->assertEquals(4, count($data->items));
     $this->assertEquals('One', $data->items[0]->name);
@@ -96,8 +100,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('mf2+html', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals('feed', $data->type);
     $this->assertEquals(4, count($data->items));
     $this->assertEquals('One', $data->items[0]->name);
@@ -116,8 +121,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('mf2+html', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals('feed', $data->type);
     $this->assertEquals(4, count($data->items));
     $this->assertEquals('One', $data->items[0]->name);
@@ -132,8 +138,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('mf2+html', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals('feed', $data->type);
     $this->assertEquals(4, count($data->items));
     $this->assertEquals('One', $data->items[0]->name);
@@ -153,8 +160,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('mf2+html', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals('feed', $data->type);
     $this->assertEquals(4, count($data->items));
     $this->assertEquals('One', $data->items[0]->name);
@@ -174,8 +182,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('mf2+html', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals('card', $data->type);
     $this->assertEquals('Author Name', $data->name);
   }
@@ -186,7 +195,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
+    $result = json_decode($body);
+    $this->assertEquals('feed+json', $result->{'source-format'});
+    $data = $result->data;
 
     $this->assertEquals(10, count($data->items));
     for($i=0; $i<8; $i++) {
@@ -217,7 +228,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
+    $result = json_decode($body);
+    $this->assertEquals('xml', $result->{'source-format'});
+    $data = $result->data;
 
     $this->assertEquals(8, count($data->items));
     for($i=0; $i<8; $i++) {
@@ -246,7 +259,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
+    $result = json_decode($body);
+    $this->assertEquals('xml', $result->{'source-format'});
+    $data = $result->data;
 
     $this->assertEquals(10, count($data->items));
     for($i=0; $i<10; $i++) {
@@ -276,7 +291,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
+    $result = json_decode($body);
+    $this->assertEquals('xml', $result->{'source-format'});
+    $data = $result->data;
 
     $this->assertEquals(12, count($data->items));
     for($i=0; $i<12; $i++) {
@@ -309,8 +326,9 @@ class FeedTest extends PHPUnit_Framework_TestCase {
 
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
-    $data = json_decode($body)->data;
-
+    $result = json_decode($body);
+    $this->assertEquals('xml', $result->{'source-format'});
+    $data = $result->data;
     $this->assertEquals(12, count($data->items));
 
     $this->assertEquals('Marshall Kirkpatrick', $data->items[11]->author->name);
diff --git a/tests/GitHubTest.php b/tests/GitHubTest.php
index 506300f..d17a00e 100644
--- a/tests/GitHubTest.php
+++ b/tests/GitHubTest.php
@@ -27,6 +27,9 @@ class GitHubTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('github', $data['source-format']);
+
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('reply', $data['data']['post-type']);
     $this->assertEquals('https://github.com/idno/Known', $data['data']['in-reply-to'][0]);
@@ -47,6 +50,9 @@ class GitHubTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('github', $data['source-format']);
+
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('reply', $data['data']['post-type']);
     $this->assertEquals('https://github.com/aaronpk/XRay/issues', $data['data']['in-reply-to'][0]);
@@ -68,6 +74,9 @@ class GitHubTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('github', $data['source-format']);
+
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertContains('silo', $data['data']['category']);
   }
@@ -80,6 +89,9 @@ class GitHubTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('github', $data['source-format']);
+
     $this->assertEquals('repo', $data['data']['type']);
     $this->assertArrayNotHasKey('post-type', $data['data']);
     $this->assertEquals('2016-02-19T16:53:20Z', $data['data']['published']);
@@ -98,6 +110,9 @@ class GitHubTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('github', $data['source-format']);
+
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('reply', $data['data']['post-type']);
     $this->assertEquals('https://github.com/aaronpk/XRay/issues/25', $data['data']['in-reply-to'][0]);
diff --git a/tests/HackernewsTest.php b/tests/HackernewsTest.php
index 730516c..cd171af 100644
--- a/tests/HackernewsTest.php
+++ b/tests/HackernewsTest.php
@@ -26,6 +26,9 @@ class HackernewsTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('hackernews', $data['source-format']);
+
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('article', $data['data']['post-type']);
     $this->assertEquals('2017-06-08T19:32:12+00:00', $data['data']['published']);
@@ -50,6 +53,9 @@ What projects or companies are you working on to combat filter bubbles, walled g
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('hackernews', $data['source-format']);
+
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('reply', $data['data']['post-type']);
     $this->assertEquals('2017-06-08T20:23:20+00:00', $data['data']['published']);
diff --git a/tests/InstagramTest.php b/tests/InstagramTest.php
index 004f5bb..4d2af9c 100644
--- a/tests/InstagramTest.php
+++ b/tests/InstagramTest.php
@@ -27,6 +27,8 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('photo', $data['data']['post-type']);
     $this->assertEquals('2017-01-05T23:31:32+00:00', $data['data']['published']);
@@ -49,6 +51,9 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
+
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('photo', $data['data']['post-type']);
     $this->assertSame([
@@ -88,6 +93,9 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
+
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('video', $data['data']['post-type']);
     $this->assertContains('100daysofmusic', $data['data']['category']);
@@ -110,6 +118,9 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
+
     $this->assertEquals(2, count($data['data']['category']));
     $this->assertContains('http://www.kmikeym.com/', $data['data']['category']);
     $this->assertArrayHasKey('http://www.kmikeym.com/', $data['data']['refs']);
@@ -125,6 +136,9 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
+
     $this->assertEquals(1, count($data['data']['location']));
     $this->assertContains('https://www.instagram.com/explore/locations/109284789535230/', $data['data']['location']);
     $this->assertArrayHasKey('https://www.instagram.com/explore/locations/109284789535230/', $data['data']['refs']);
@@ -145,6 +159,9 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
+
     $this->assertEquals(2, count($data['data']['photo']));
     $this->assertEquals('https://instagram.fsea1-1.fna.fbcdn.net/vp/406101ff9601ab78147e121b65ce3eea/5B5BC738/t51.2885-15/e35/21827424_134752690591737_8093088291252862976_n.jpg', $data['data']['photo'][0]);
     $this->assertEquals('https://instagram.fsea1-1.fna.fbcdn.net/vp/03ddc8c03c8708439dae29663b8c2305/5B5EDE4D/t51.2885-15/e35/21909774_347707439021016_5237540582556958720_n.jpg', $data['data']['photo'][1]);
@@ -161,6 +178,9 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
+
     $this->assertEquals('photo', $data['data']['post-type']); // we discard videos in this case right now
     $this->assertEquals(3, count($data['data']['photo']));
     $this->assertEquals('https://instagram.fsea1-1.fna.fbcdn.net/vp/b0f6cd9dc4d5c3371efe9f412a0d7f0b/5B6BC5B8/t51.2885-15/e35/21878922_686481254874005_8468823712617988096_n.jpg', $data['data']['photo'][0]);
@@ -178,6 +198,9 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
+
     $this->assertSame([
       'type' => 'card',
       'name' => 'Aaron Parecki',
@@ -195,6 +218,9 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
+
     $this->assertSame([
       'type' => 'card',
       'name' => 'pk_spam',
@@ -212,6 +238,9 @@ class InstagramTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('instagram', $data['source-format']);
+
     $this->assertEquals('feed', $data['data']['type']);
     $this->assertEquals(12, count($data['data']['items']));
     $this->assertEquals('https://www.instagram.com/p/Be0lBpGDncI/', $data['data']['items'][0]['url']);
diff --git a/tests/ParseTest.php b/tests/ParseTest.php
index caac278..6507f97 100644
--- a/tests/ParseTest.php
+++ b/tests/ParseTest.php
@@ -87,6 +87,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     ]);
     $xray = new \p3k\XRay();
     $parsed = $xray->process(false, $mf2JSON);
+    $this->assertEquals('mf2+json', $parsed['source-format']);
     $item = $parsed['data'];
     $this->assertEquals('entry', $item['type']);
     $this->assertEquals('note', $item['post-type']);
@@ -107,6 +108,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     ]);
     $xray = new \p3k\XRay();
     $parsed = $xray->process(false, $mf2JSON);
+    $this->assertEquals('mf2+json', $parsed['source-format']);
     $item = $parsed['data'];
     $this->assertEquals('entry', $item['type']);
     $this->assertEquals('note', $item['post-type']);
@@ -127,6 +129,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     ]);
     $xray = new \p3k\XRay();
     $parsed = $xray->process(false, $mf2JSON);
+    $this->assertEquals('mf2+json', $parsed['source-format']);
     $item = $parsed['data'];
     $this->assertEquals('entry', $item['type']);
     $this->assertEquals('note', $item['post-type']);
@@ -147,6 +150,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     ]);
     $xray = new \p3k\XRay();
     $parsed = $xray->process(false, $mf2JSON);
+    $this->assertEquals('mf2+json', $parsed['source-format']);
     $item = $parsed['data'];
     $this->assertEquals('entry', $item['type']);
     $this->assertEquals('note', $item['post-type']);
@@ -167,6 +171,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     ]);
     $xray = new \p3k\XRay();
     $parsed = $xray->process(false, $mf2JSON);
+    $this->assertEquals('mf2+json', $parsed['source-format']);
     $item = $parsed['data'];
     $this->assertEquals('entry', $item['type']);
     $this->assertEquals('note', $item['post-type']);
@@ -180,6 +185,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEquals('photo', $data->data->{'post-type'});
     $this->assertObjectNotHasAttribute('name', $data->data);
     $this->assertEquals('This page has an img tag with the target URL.', $data->data->content->text);
@@ -192,6 +198,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEquals('video', $data->data->{'post-type'});
     $this->assertObjectNotHasAttribute('name', $data->data);
     $this->assertEquals('This page has a video tag with the target URL.', $data->data->content->text);
@@ -204,6 +211,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEquals('audio', $data->data->{'post-type'});
     $this->assertObjectNotHasAttribute('name', $data->data);
     $this->assertEquals('This page has an audio tag with the target URL.', $data->data->content->text);
@@ -216,6 +224,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertObjectNotHasAttribute('name', $data->data);
     $this->assertEquals('This page has a link to target.example.com and some formatted text but is in a p-content element so is plaintext.', $data->data->content->text);
   }
@@ -227,6 +236,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEquals('article', $data->data->{'post-type'});
     $this->assertEquals('Post Title', $data->data->name);
     $this->assertEquals('This is a blog post.', $data->data->content->text);
@@ -240,6 +250,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertObjectNotHasAttribute('name', $data->data);
     $this->assertEquals('note', $data->data->{'post-type'});
     $this->assertEquals('This page has a link to target.example.com and some formatted text.', $data->data->content->text);
@@ -253,6 +264,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEquals('Hello World', $data->data->name);
     $this->assertEquals('article', $data->data->{'post-type'});
     $this->assertEquals('This page has a link to target.example.com and some formatted text.', $data->data->content->text);
@@ -266,6 +278,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEquals('Hello World', $data->data->name);
     $this->assertEquals('article', $data->data->{'post-type'});
     $this->assertObjectNotHasAttribute('content', $data->data);
@@ -278,6 +291,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEquals(['indieweb'], $data->data->category);
   }
 
@@ -288,6 +302,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertContains('indieweb', $data->data->category);
     $this->assertContains('xray', $data->data->category);
     $this->assertEquals(2, count($data->data->category));
@@ -300,6 +315,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEquals('unknown', $data->data->type);
   }
 
@@ -310,6 +326,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('http://example.com/100', $data['data']['in-reply-to'][0]);
   }
@@ -321,6 +338,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('reply', $data['data']['post-type']);
     $this->assertEquals('http://example.com/100', $data['data']['in-reply-to'][0]);
@@ -336,6 +354,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('http://alice.example.com/', $data['data']['category'][0]);
   }
@@ -347,6 +366,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('http://alice.example.com/', $data['data']['category'][0]);
     $this->assertArrayHasKey('http://alice.example.com/', $data['data']['refs']);
@@ -362,6 +382,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('http://syndicated.example/', $data['data']['syndication'][0]);
   }
@@ -373,6 +394,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertObjectNotHasAttribute('content', $data->data);
     $this->assertEquals('This is a Post', $data->data->name);
   }
@@ -384,6 +406,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('Hello World', $data['data']['content']['text']);
   }
@@ -395,6 +418,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('rsvp', $data['data']['post-type']);
     $this->assertEquals('I\'ll be there!', $data['data']['content']['text']);
@@ -408,6 +432,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('Primary Post', $data['data']['name']);
   }
@@ -419,6 +444,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('Hello World', $data['data']['content']['text']);
   }
@@ -430,6 +456,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('Hello World', $data['data']['content']['text']);
   }
@@ -441,6 +468,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('Hello World', $data['data']['content']['text']);
   }
@@ -452,6 +480,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
   }
 
@@ -463,6 +492,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('event', $data['data']['type']);
     $this->assertEquals('event', $data['data']['post-type']);
     $this->assertEquals('Homebrew Website Club', $data['data']['name']);
@@ -482,6 +512,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('event', $data['data']['type']);
     $this->assertEquals('event', $data['data']['post-type']);
     $this->assertEquals('Homebrew Website Club', $data['data']['name']);
@@ -500,7 +531,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
-
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('event', $data['data']['type']);
     $this->assertEquals('event', $data['data']['post-type']);
     $this->assertEquals('Homebrew Website Club', $data['data']['name']);
@@ -520,7 +551,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
-
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('review', $data['data']['type']);
     $this->assertEquals('review', $data['data']['post-type']);
     $this->assertEquals('Review', $data['data']['name']);
@@ -544,7 +575,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
-
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('review', $data['data']['type']);
     $this->assertEquals('review', $data['data']['post-type']);
     $this->assertEquals('Review', $data['data']['name']);
@@ -566,7 +597,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
-
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('review', $data['data']['type']);
     $this->assertEquals('review', $data['data']['post-type']);
     $this->assertEquals('Not great', $data['data']['name']);
@@ -588,6 +619,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('recipe', $data['data']['type']);
     $this->assertEquals('recipe', $data['data']['post-type']);
     $this->assertEquals('Cookie Recipe', $data['data']['name']);
@@ -606,6 +638,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('https://www.facebook.com/555707837940351#tantek', $data['data']['url']);
     $this->assertContains('https://www.facebook.com/tantek.celik', $data['data']['invitee']);
@@ -620,6 +653,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('note', $data['data']['post-type']);
     $this->assertEquals('Comment text', $data['data']['content']['text']);
@@ -634,6 +668,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('http://source.example.com/fragment-id', $data['data']['url']);
     $this->assertFalse($data['info']['found_fragment']);
@@ -647,6 +682,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $venue = $data['data']['checkin'];
     $this->assertEquals('checkin', $data['data']['post-type']);
@@ -667,6 +703,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('checkin', $data['data']['post-type']);
     $venue = $data['data']['checkin'];
@@ -684,6 +721,8 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals(200, $data['code']);
+    $this->assertEquals('xkcd', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('photo', $data['data']['post-type']);
     $this->assertEquals('http://xkcd.com/1810/', $data['data']['url']);
@@ -728,6 +767,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+json', $data['source-format']);
 
     $this->assertEquals('Hello World', $data['data']['content']['text']);
     $this->assertEquals('http://example.com/photo.jpg', $data['data']['photo'][0]);
@@ -747,6 +787,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
 
+    $this->assertEquals('mf2+json', $data['source-format']);
     $this->assertEquals('Hello World', $data['data']['content']['text']);
     $this->assertEquals('<b>Hello</b> <i>World</i>', $data['data']['content']['html']);
     $this->assertEquals('http://example.com/photo.jpg', $data['data']['photo'][0]);
@@ -759,6 +800,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body, true);
+    $this->assertEquals('mf2+html', $data['source-format']);
     $this->assertEquals('app', $data['data']['type']);
     $this->assertEquals('http://source.example.com/images/quill.png', $data['data']['logo']);
     $this->assertEquals('Quill', $data['data']['name']);
@@ -774,6 +816,7 @@ class ParseTest extends PHPUnit_Framework_TestCase {
     $body = $response->getContent();
     $this->assertEquals(200, $response->getStatusCode());
     $data = json_decode($body);
+    $this->assertEquals('mf2+html', $data->{'source-format'});
     $this->assertEquals('app', $data->data->type);
     $this->assertEquals('http://source.example.com/images/quill.png', $data->data->logo);
     $this->assertEquals('Quill', $data->data->name);
diff --git a/tests/TwitterTest.php b/tests/TwitterTest.php
index cfe0e68..b498f18 100644
--- a/tests/TwitterTest.php
+++ b/tests/TwitterTest.php
@@ -31,6 +31,8 @@ class TwitterTest extends PHPUnit_Framework_TestCase {
 
     $data = $this->parse(['url' => $url, 'body' => $json]);
 
+    $this->assertEquals('twitter', $data['source-format']);
+
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('aaronpk dev', $data['data']['author']['name']);
     $this->assertEquals('pkdev', $data['data']['author']['nickname']);
@@ -54,6 +56,8 @@ class TwitterTest extends PHPUnit_Framework_TestCase {
     $data = $this->parse(['url' => $url, 'body' => $json]);
 
     $this->assertEquals(null, $data['code']); // no code is expected if we pass in the body
+    $this->assertEquals('twitter', $data['source-format']);
+
     $this->assertEquals('https://twitter.com/pkdev/status/818913630569664512', $data['url']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('note', $data['data']['post-type']);
@@ -77,6 +81,7 @@ class TwitterTest extends PHPUnit_Framework_TestCase {
 
     $data = $this->parse(['url' => $url, 'body' => $json]);
 
+    $this->assertEquals('twitter', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('Here 🎉 have an emoji', $data['data']['content']['text']);
   }
@@ -158,6 +163,7 @@ class TwitterTest extends PHPUnit_Framework_TestCase {
 
     $data = $this->parse(['url' => $url, 'body' => $json]);
 
+    $this->assertEquals('twitter', $data['source-format']);
     $this->assertEquals('entry', $data['data']['type']);
     $this->assertEquals('repost', $data['data']['post-type']);
     $this->assertArrayNotHasKey('content', $data['data']);
@@ -212,6 +218,7 @@ class TwitterTest extends PHPUnit_Framework_TestCase {
     list($url, $json) = $this->loadTweet('streaming-tweet-with-link');
     $data = $this->parse(['url' => $url, 'body' => $json]);
 
+    $this->assertEquals('twitter', $data['source-format']);
     $this->assertEquals('what happens if i include a link like https://kmikeym.com', $data['data']['content']['text']);
     $this->assertEquals('what happens if i include a link like <a href="https://kmikeym.com">https://kmikeym.com</a>', $data['data']['content']['html']);
   }
@@ -269,6 +276,7 @@ Woke up this morning feeling compelled to run to Corona… http://tantek.com/201
     list($url, $json) = $this->loadTweet('streaming-tweet-reply');
     $data = $this->parse(['url' => $url, 'body' => $json]);
 
+    $this->assertEquals('twitter', $data['source-format']);
     $this->assertEquals('https://twitter.com/anomalily/status/967024586423386112', $data['data']['in-reply-to'][0]);
   }
 
@@ -276,6 +284,7 @@ Woke up this morning feeling compelled to run to Corona… http://tantek.com/201
     list($url, $json) = $this->loadTweet('967046438822674432');
     $data = $this->parse(['url' => $url, 'body' => $json]);
 
+    $this->assertEquals('twitter', $data['source-format']);
     $this->assertEquals('https://twitter.com/anomalily/status/967024586423386112', $data['data']['in-reply-to'][0]);
   }