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Neat and simple, but that's exactly the kind of things that makes me go "too bad it's not open sourced, I could use that"

To be honest, the value resides more in the idea and the fact that it's already online than in the code.

A basic implementation of this service would take less than 100 lines in any language commonly used on the web.

Of course. It's just that it's easier and quicker to use something that someone has already developed, than recreate the 100-lines wheel each time.

Which is why I'm confused as to why you want an open-source version? Just use this one.

Anyone can PUT and replace your data.

Maybe ozh wants to host the service on their own server? Or they've found a bug they want to fix?

Give JSON Blob (https://github.com/tburch/jsonblob) a try! It's open sourced and you can run it locally if you want.