I was recently working on a new project developing against Twitter using their JSON interface. Turns out that the Twitter app has an awesome little feature to assist with such a task, a Console. To see the menu for the Console, enable the Develop menu, by putting a true boolean ShowDevelopMenu key into the com.twitter.twitter-mac.plist:
defaults write com.twitter.twitter-mac ShowDevelopMenu -bool true
Once enabled, use the Develop menu to open Console. Here, you can select various buttons and see the GET, POST, PUT or DELETE sent. as well as the entities sent.
To disable the Develop menu:
defaults write com.twitter.twitter-mac ShowDevelopMenu -bool false
