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There are already some implementations: - https://github.com/dharmafly/jsonpatch.js - https://github.com/stefankoegl/python-json-patch

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This JavaScript implementation is up to date https://github.com/bruth/jsonpatch-js

(I am the author)

Do you know of a good library for generating a patch from two JSON structures that, when applied to structure A, would produce structure B?

I implemented this a while back, but have not yet cleaned it up nor turned it into a library: http://jsfiddle.net/bruth/p6SUF/ Open up the console to see the output.

Here is slightly cleaner one that I plan to submit as a feature to Backbone. It assumes underscore.js is present: https://github.com/bruth/backbone/commit/a7f8bd3d9fa06a63cf4... Here is a JSFiddle example: http://jsfiddle.net/bruth/pwpNw/ (Open up the console to see the output)

EDIT: Add JSFiddle example for second implementation

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