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Reddit. Append '.json' to any path and you'll get JSON. It's a thing of beauty.

Ex: https://www.reddit.com/r/programming.json

http://www.reddit.com/.json

Why yes, that is beautiful. :)

Reddit's API is pretty easy to get started with. Find a page within Reddit that contains the data you want, add ".json" to the URL, and chances are very good that you'll get exactly what you need.

So many apis. facebook, twitter, gdelt, soundcloud, forecast, archive.org, product hunt, pinterest, reddit, etc.