diff --git a/config/initializers/mime_types.rb b/config/initializers/mime_types.rb
index 71e3c9d7db..ca58ae92d1 100644
--- a/config/initializers/mime_types.rb
+++ b/config/initializers/mime_types.rb
@@ -8,10 +8,3 @@ Mime::Type.register_alias "text/plain", :diff
 Mime::Type.register_alias "text/plain", :patch
 Mime::Type.register_alias 'text/html',  :markdown
 Mime::Type.register_alias 'text/html',  :md
-#Mime::Type.unregister :json
-Mime::Type.register_alias 'application/vnd.docker.distribution.manifest.v1+prettyjws', :json
-#Mime::Type.register 'application/json', :json, %w( text/plain text/x-json application/jsonrequest )
-
-ActionDispatch::ParamsParser::DEFAULT_PARSERS[Mime::Type.lookup('application/vnd.docker.distribution.manifest.v1+prettyjws')]=lambda do |body|
-  JSON.parse(body)
-end