JsonRpc < IVOA

IVOA Web>IvoaApplications>InterOpMay2007Applications>InterOpMay2007AppsMessagingMinutes>JsonRpc (2007-05-23, MarkTaylor) (raw view)

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---+ JSON-RPC

*JSON-RPC* is a remote procedure call protocol based on JSON.  JSON-RPC is documented at [[http://json-rpc.org/]].

*JSON* is a specification for encoding and decoding structured data: numbers, strings, booleans, and arrays (lists) or objects (associative arrays) composed of them.  Although the J stands for Javascript, it is in no way dependent on Javascript, Java or any other particular language.  It is formally defined in [[http://www.ietf.org/rfc/rfc4627.txt?number=4627][RFC4627]], which is only seven pages long, so writing JSON serializers/deserializers is not hard in any reasonable language.
There is an introduction and list of resources (including libraries for various languages) at [[http://www.json.org/]].

JSON-RPC provides a very small amount of additional structure on top of JSON itself to define an RPC protocol.  It is not tied to a particular underlying transport, but HTTP POST is discussed on the web site and a persistent connection seems to be assumed.  However, other RPC or messaging protocols which use JSON for structured data encoding (for instance, ones with more per-message metadata, or ones which use HTTP GET rather than persistent connections) would be easy to specify.  

-- IVOA.MarkTaylor - 23 May 2007










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Topic revision: r1 - 2007-05-23 - MarkTaylor

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