Count number of Keys

POST http://postman-echo.com/post

Request Body

{"0"=>{"_id"=>"604a3774ee6b45c41fc3c62d", "index"=>0, "name"=>"Melisa Edwards", "friends"=>[{"id"=>0, "name"=>"Traci Brennan"}, {"id"=>1, "name"=>"Solomon Hayes"}, {"id"=>2, "name"=>"Simpson Santiago"}], "greeting"=>"Hello, Melisa Edwards! You have 8 unread messages."}, "1"=>{"_id"=>"604a37745677b6eba7703343", "index"=>1, "name"=>"Vickie Witt", "friends"=>[{"id"=>0, "name"=>"Roth Farley"}, {"id"=>1, "name"=>"Angeline Eaton"}, {"id"=>2, "name"=>"Jeanette Rosario"}], "greeting"=>"Hello, Vickie Witt! You have 10 unread messages."}}