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I guess I'm confused then. If I wanted a complicated standard but one with broad consensus and lots of library support behind it, why wouldn't I just use XML-RPC? Other than not being XML, what does JSON API offer? Because at first glance, it looks just about as verbose and unfriendly as XML-RPC to me.

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Json-rpc it's what you get anyway most of the time since very few have a clue of what rest is. Not that is a bad design by itself, many of them are concise and workable without being rest.

What I am concerned mostly is the added overhead of fitting everything under a single standard. Sometime you need state aware api, sometime you need data retrieval api, sometime you need to expose a remote interface to constraint manipulating objects with server side rules.

Why it all has to be a standard escapes me. You mostly get absurdly convoluted operation when you try to fit one model under another.

JSON API adheres to RESTful principles and constraints: it uses HTTP verbs to fetch and manipulate resources and provides allowances for hypermedia. XML-RPC is neither RESTful nor supportive of hypermedia and has no place in building a REST API.

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