doorkeeper auth flow not working - ruby-on-rails

Question

I am trying to perform the oauth2 flow as described by https://github.com/doorkeeper-gem/doorkeeper/wiki/Interacting-as-an-OAuth-client-with-Doorkeeper#writing-a-raw-oauth-client, but I get a 401 when
I try to retrieve the access token. Here is what I am doing
1) click the authorize button on the application as seen here
2) I authorize the application on the next screen and I'm given a url of the form chromiumapp.org/?code=eb775dba8811f605c672a0aac8472972eabaae87446ac957e2b71c57b0b10e6e
3) Given this code I perform
curl -XPOST http://localhost:3000/oauth/token -d '{
"client_id": CLIENT_ID,
"client_secret": CLIENT_SECRET,
"redirect_uri": "https://galaiojniedmogfplghkjnmcfnlbpbpg.chromiumapp.org/",
"grant_type": "authorization_code",
"code": "eb775dba8811f605c672a0aac8472972eabaae87446ac957e2b71c57b0b10e6e"
}`
However this returns {"error":"invalid_request","error_description":"The request is missing a required parameter, includes an unsupported parameter value, or is otherwise malformed."}
Is there some part of the flow that I'm missing or is there something incorrect in the documentation?

Answer 1

I have updated the wiki I linked above, but incase others come across this question, per the rfc, the parameters on the token request must be form urlencoded.
curl -XPOST http://localhost:3000/oauth/token
-F "client_id=CLIENT_ID"
-F "client_secret=CLIENT_SECRET"
-F "redirect_uri=https://galaiojniedmogfplghkjnmcfnlbpbpg.chromiumapp.org/"
-F "grant_type=authorization_code"
-F "code=eb775dba8811f605c672a0aac8472972eabaae87446ac957e2b71c57b0b10e6e"