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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.