The Tumbler V2 API provides a pure JSON response but requires jumping through a few hoops:
- Register an application
- Get your "OAuth Consumer Key" which you'll find when editing your application from the apps page
- Use any of the methods that only require an API Key for authentication as this can be passed in the URL, e.g. posts
- Enjoy your JSON response!
Example URL: http://api.tumblr.com/v2/blog/puppygifs.tumblr.com/posts/photo?api_key=YOUR_KEY_HERE
Result showing tree structure in Fiddler:
