Added 'json' to config/mimes.php.
diff --git a/application/config/mimes.php b/application/config/mimes.php
index 58eea5f..8065794 100644
--- a/application/config/mimes.php
+++ b/application/config/mimes.php
@@ -97,7 +97,8 @@
'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'word' => array('application/msword', 'application/octet-stream'),
'xl' => 'application/excel',
- 'eml' => 'message/rfc822'
+ 'eml' => 'message/rfc822',
+ 'json' => array('application/json', 'text/json')
);