https://www.google.com/reader/api/0/stream/contents/feed/FEEDHERE?output=json&n=20
I'm using this right now to parse RSS and Atom feeds, for a lot of reasons. But there is no official API key or something so I'm afraid something may break in the future, like Google stopping my access if I make a lot of queries.
Is there an alternative to this with API keys?
There are multiple alternatives.
There's Feedly. It’s not the minimalistic, omnipresent glory that is Google Reader, but it’s close, and in some ways exceeds Reader’s capabilities. They've got even a guide for transitioning.
There's NewsBlur. It's developed "in the open", aka you can just check it out on their GitHub.
There's Netvibes. However. Unlike Feedly there's no simple import route in Netvibes for integrating your Google Reader subscriptions. Instead, you need to export your Reader subscriptions as a .ZIP file, extract them to find the 'Subscriptions.xml' file and then import that into Netvibes.
There's also another question on the same subject on Stack Overflow.
And there's many more, just do a Google search.
In my (and many others') opinion, Feedly's the best alternative. But each their own. Good luck!
Try Google Feed Api, it is easy to use. It supports JSON and XML formats, but it is limited to a maximum of 250 feeds per url.
