Parse JSON POST request into nginx variable

[justink101]

How can I read a POST request body which is JSON and get a property?  I need
to read a property and use it as a variable in proxy_pass.

Pseudo code:

   $post_request_body = '{"account": "test.mydomain.com", "more-stuff":
"here"}';
   // I want to get
   $account = "test.mydomain.com";
   proxy_pass $account/rest/of/url/here;

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,250864,250864#msg-250864